diff --git a/app/assets/javascripts/base.js b/app/assets/javascripts/base.js
index b7263d48..08e9afd1 100644
--- a/app/assets/javascripts/base.js
+++ b/app/assets/javascripts/base.js
@@ -11,7 +11,7 @@ window.CodeOcean = {
 var ANIMATION_DURATION = 500;
 
 $.isController = function(name) {
-  return $('.container[data-controller="' + name + '"]').isPresent();
+  return $('div[data-controller="' + name + '"]').isPresent();
 };
 
 $.fn.isPresent = function() {
diff --git a/app/assets/javascripts/editor/editor.js.erb b/app/assets/javascripts/editor/editor.js.erb
index c4cb46f9..33271a44 100644
--- a/app/assets/javascripts/editor/editor.js.erb
+++ b/app/assets/javascripts/editor/editor.js.erb
@@ -110,6 +110,10 @@ configureEditors: function () {
 
   // The event ready.jstree is fired too early and thus doesn't work.
   selectFileInJsTree: function(filetree, file_id) {
+    if (!filetree.is(':visible'))
+        // The left sidebar is not shown and thus the filetree is not rendered.
+        return;
+
     if (!filetree.hasClass('jstree-loading')) {
       filetree.jstree("deselect_all");
       filetree.jstree().select_node(file_id);
@@ -224,6 +228,11 @@ configureEditors: function () {
       // remove last (empty) that is there by default line
       document.removeLines(document.getLength() - 1, document.getLength() - 1);
       editor.setReadOnly($(element).data('read-only') !== undefined);
+      if (editor.getReadOnly()) {
+        editor.setHighlightActiveLine(false);
+        editor.setHighlightGutterLine(false);
+        editor.renderer.$cursorLayer.element.style.opacity = 0;
+      }
       editor.setShowPrintMargin(false);
       editor.setTheme(this.THEME);
 
@@ -458,7 +467,7 @@ configureEditors: function () {
 
     var editor = this.editor_for_file.get(file);
     editor.gotoLine(line, 0);
-
+    event.preventDefault();
   },
 
   augmentStacktraceInOutput: function () {
@@ -722,6 +731,7 @@ configureEditors: function () {
     this.initPrompt();
     this.renderScore();
     this.showFirstFile();
+    this.resizeAceEditors();
 
     $(window).on("beforeunload", this.unloadAutoSave.bind(this));
     // create autosave when the editor is opened the first time
diff --git a/app/assets/javascripts/editor/evaluation.js b/app/assets/javascripts/editor/evaluation.js
index 5e631b2b..74a77ce3 100644
--- a/app/assets/javascripts/editor/evaluation.js
+++ b/app/assets/javascripts/editor/evaluation.js
@@ -27,8 +27,11 @@ CodeOceanEditorEvaluation = {
   printScoringResult: function (result, index) {
     $('#results').show();
     var card = $('#dummies').children().first().clone();
-    this.populateCard(card, result, index);
-    $('#results ul').first().append(card);
+    if (card.isPresent()) {
+        // the card won't be present if @embed_options[::hide_test_results] == true
+        this.populateCard(card, result, index);
+        $('#results ul').first().append(card);
+    }
   },
 
   printScoringResults: function (response) {
@@ -141,14 +144,19 @@ CodeOceanEditorEvaluation = {
   },
 
   printOutput: function (output, colorize, index) {
+    if (output.stderr === undefined && output.stdout === undefined) {
+        // Prevent empty element with no text at all
+        return;
+    }
+
     var element = this.findOrCreateOutputElement(index);
     if (!colorize) {
-      if (output.stdout != undefined && output.stdout != '') {
+      if (output.stdout !== undefined && output.stdout !== '') {
         //element.append(output.stdout)
         element.text(element.text() + output.stdout)
       }
 
-      if (output.stderr != undefined && output.stderr != '') {
+      if (output.stderr !== undefined && output.stderr !== '') {
         //element.append('StdErr: ' + output.stderr);
         element.text('StdErr: ' + element.text() + output.stderr);
       }
diff --git a/app/assets/javascripts/editor/participantsupport.js.erb b/app/assets/javascripts/editor/participantsupport.js.erb
index 9a8e54f8..23e98009 100644
--- a/app/assets/javascripts/editor/participantsupport.js.erb
+++ b/app/assets/javascripts/editor/participantsupport.js.erb
@@ -172,8 +172,9 @@ CodeOceanEditorRequestForComments = {
     this.createSubmission($('#requestComments'), null, createRequestForComments.bind(this));
 
     $('#comment-modal').modal('hide');
+    $('#question').val('');
     // we disabled the button to prevent that the user spams RFCs, but decided against this now.
     //var button = $('#requestComments');
     //button.prop('disabled', true);
-  },
+  }
 };
diff --git a/app/assets/javascripts/editor/submissions.js b/app/assets/javascripts/editor/submissions.js
index f55bdbb5..20911535 100644
--- a/app/assets/javascripts/editor/submissions.js
+++ b/app/assets/javascripts/editor/submissions.js
@@ -10,6 +10,7 @@ CodeOceanEditorSubmissions = {
    */
   createSubmission: function (initiator, filter, callback) {
     this.showSpinner(initiator);
+    var url = $(initiator).data('url') || $('#editor').data('submissions-url');
     var jqxhr = this.ajax({
       data: {
         submission: {
@@ -21,7 +22,7 @@ CodeOceanEditorSubmissions = {
       },
       dataType: 'json',
       method: 'POST',
-      url: $(initiator).data('url') || $('#editor').data('submissions-url')
+      url: url + '.json'
     });
     jqxhr.always(this.hideSpinner.bind(this));
     jqxhr.done(this.createSubmissionCallback.bind(this));
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index c58303ba..2fcece66 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -5,7 +5,7 @@ class ApplicationController < ActionController::Base
   MEMBER_ACTIONS = [:destroy, :edit, :show, :update]
 
   after_action :verify_authorized, except: [:help, :welcome]
-  before_action :set_locale, :allow_iframe_requests
+  before_action :set_locale, :allow_iframe_requests, :load_embed_options
   protect_from_forgery(with: :exception, prepend: true)
   rescue_from Pundit::NotAuthorizedError, with: :render_not_authorized
 
@@ -38,4 +38,14 @@ class ApplicationController < ActionController::Base
   def allow_iframe_requests
     response.headers.delete('X-Frame-Options')
   end
+
+  def load_embed_options
+    if session[:embed_options].present? && session[:embed_options].is_a?(Hash)
+      @embed_options = session[:embed_options].symbolize_keys
+    else
+      @embed_options = {}
+    end
+    @embed_options
+  end
+  private :load_embed_options
 end
diff --git a/app/controllers/concerns/lti.rb b/app/controllers/concerns/lti.rb
index e8241af3..8ca57be9 100644
--- a/app/controllers/concerns/lti.rb
+++ b/app/controllers/concerns/lti.rb
@@ -22,6 +22,7 @@ module Lti
     if (exercise_id.nil?)
       session.delete(:consumer_id)
       session.delete(:external_user_id)
+      session.delete(:embed_options)
     else
       LtiParameter.where(consumers_id: consumer_id,
                          external_users_id: user_id,
@@ -133,6 +134,26 @@ module Lti
   end
   private :set_current_user
 
+  def set_embedding_options
+    @embed_options = {}
+    [:hide_navbar,
+     :hide_exercise_description,
+     :disable_run,
+     :disable_score,
+     :disable_rfc,
+     :disable_interventions,
+     :hide_sidebar,
+     :read_only,
+     :hide_test_results,
+     :disable_hints].each do |option|
+      value = params["custom_embed_options_#{option}".to_sym] == 'true'
+      # Optimize storage and save only those that are true, the session cookie is limited to 4KB
+      @embed_options[option] = value if value.present?
+    end
+    session[:embed_options] = @embed_options
+  end
+  private :set_embedding_options
+
   def store_lti_session_data(options = {})
     lti_parameters = LtiParameter.find_or_create_by(consumers_id: options[:consumer].id,
                                                     external_users_id: @current_user.id,
diff --git a/app/controllers/concerns/submission_scoring.rb b/app/controllers/concerns/submission_scoring.rb
index 06bba11c..7436ac51 100644
--- a/app/controllers/concerns/submission_scoring.rb
+++ b/app/controllers/concerns/submission_scoring.rb
@@ -55,6 +55,11 @@ module SubmissionScoring
         }
       end
     end
+    if @embed_options.present? && @embed_options[:hide_test_results] && outputs.present?
+      outputs.each do |output|
+        output.except!(:error_messages, :count, :failed, :filename, :message, :passed, :stderr, :stdout)
+      end
+    end
     outputs
   end
 end
diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 839aef4c..79a669cf 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -188,7 +188,15 @@ class ExercisesController < ApplicationController
     user_got_intervention_in_exercise = UserExerciseIntervention.where(user: current_user, exercise: @exercise).size >= max_intervention_count_per_exercise
     user_got_enough_interventions = count_interventions_today >= max_intervention_count_per_day or user_got_intervention_in_exercise
 
-    @show_rfc_interventions = (not user_solved_exercise and not user_got_enough_interventions).to_s
+    unless @embed_options[:disable_interventions]
+      @show_rfc_interventions = (not user_solved_exercise and not user_got_enough_interventions).to_s
+      @show_break_interventions = false
+    else
+      @show_rfc_interventions = false
+      @show_break_interventions = false
+    end
+
+    @hide_rfc_button = @embed_options[:disable_rfc]
 
 
     @search = Search.new
diff --git a/app/controllers/flowr_controller.rb b/app/controllers/flowr_controller.rb
index e9f742b7..310d91d2 100644
--- a/app/controllers/flowr_controller.rb
+++ b/app/controllers/flowr_controller.rb
@@ -8,7 +8,7 @@ class FlowrController < ApplicationController
                      .order('testruns.created_at DESC').first
 
     # Return if no submission was found
-    if submission.blank?
+    if submission.blank? || @embed_options[:disable_hints] || @embed_options[:hide_test_results]
       skip_authorization
       render json: [], status: :ok
       return
diff --git a/app/controllers/request_for_comments_controller.rb b/app/controllers/request_for_comments_controller.rb
index 29c5a6ea..39f1ebb8 100644
--- a/app/controllers/request_for_comments_controller.rb
+++ b/app/controllers/request_for_comments_controller.rb
@@ -96,6 +96,10 @@ class RequestForCommentsController < ApplicationController
   # POST /request_for_comments
   # POST /request_for_comments.json
   def create
+    # Consider all requests as JSON
+    request.format = 'json'
+    raise Pundit::NotAuthorizedError if @embed_options[:disable_rfc]
+
     @request_for_comment = RequestForComment.new(request_for_comment_params)
     respond_to do |format|
       if @request_for_comment.save
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 8f698d1a..bd1a16ec 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -1,7 +1,7 @@
 class SessionsController < ApplicationController
   include Lti
 
-  [:require_oauth_parameters, :require_valid_consumer_key, :require_valid_oauth_signature, :require_unique_oauth_nonce, :set_current_user, :require_valid_exercise_token].each do |method_name|
+  [:require_oauth_parameters, :require_valid_consumer_key, :require_valid_oauth_signature, :require_unique_oauth_nonce, :set_current_user, :require_valid_exercise_token, :set_embedding_options].each do |method_name|
     before_action(method_name, only: :create_through_lti)
   end
 
diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index 039efa02..d6a92055 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -129,6 +129,11 @@ class SubmissionsController < ApplicationController
     # end
 
     hijack do |tubesock|
+      if @embed_options[:disable_run]
+        kill_socket(tubesock)
+        return
+      end
+
       # probably add:
       # ensure
       #   #guarantee that the thread is releasing the DB connection after it is done
@@ -291,6 +296,11 @@ class SubmissionsController < ApplicationController
 
   def score
     hijack do |tubesock|
+      if @embed_options[:disable_score]
+        kill_socket(tubesock)
+        return
+      end
+
       Thread.new { EventMachine.run } unless EventMachine.reactor_running? && EventMachine.reactor_thread.alive?
       # tubesock is the socket to the client
 
@@ -308,6 +318,7 @@ class SubmissionsController < ApplicationController
   end
 
   def send_hints(tubesock, errors)
+    return if @embed_options[:disable_hints]
     errors = errors.to_a.uniq { |e| e.hint}
     errors.each do | error |
       tubesock.send_data JSON.dump({cmd: 'hint', hint: error.hint, description: error.error_template.description})
diff --git a/app/views/application/_breadcrumbs.html.slim b/app/views/application/_breadcrumbs.html.slim
index 7899ae0e..570f5624 100644
--- a/app/views/application/_breadcrumbs.html.slim
+++ b/app/views/application/_breadcrumbs.html.slim
@@ -1,19 +1,20 @@
 - if current_user.try(:internal_user?)
-  ul.breadcrumb
-    - if model = Kernel.const_get(controller_path.classify) rescue nil
-      - object = model.find_by(id: params[:id])
-      - if model.try(:nested_resource?)
-        li.breadcrumb-item = model.model_name.human(count: 2)
-        - if object
-          li.breadcrumb-item = object
-      - else
-        li.breadcrumb-item = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
-        - if object
-          li.breadcrumb-item = link_to(object, send(:"#{model.model_name.singular}_path", object))
-      li.breadcrumb-item.active
-        - if I18n.translation_present?("shared.#{params[:action]}")
-          = t("shared.#{params[:action]}")
+  .container
+    ul.breadcrumb
+      - if model = Kernel.const_get(controller_path.classify) rescue nil
+        - object = model.find_by(id: params[:id])
+        - if model.try(:nested_resource?)
+          li.breadcrumb-item = model.model_name.human(count: 2)
+          - if object
+            li.breadcrumb-item = object
         - else
-          = t("#{controller_name}.index.#{params[:action]}")
-    - else
-      li.breadcrumb-item.active = t("breadcrumbs.#{controller_name}.#{params[:action]}")
+          li.breadcrumb-item = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
+          - if object
+            li.breadcrumb-item = link_to(object, send(:"#{model.model_name.singular}_path", object))
+        li.breadcrumb-item.active
+          - if I18n.translation_present?("shared.#{params[:action]}")
+            = t("shared.#{params[:action]}")
+          - else
+            = t("#{controller_name}.index.#{params[:action]}")
+      - else
+        li.breadcrumb-item.active = t("breadcrumbs.#{controller_name}.#{params[:action]}")
diff --git a/app/views/application/_flash.html.slim b/app/views/application/_flash.html.slim
index 4a78c032..4675a913 100644
--- a/app/views/application/_flash.html.slim
+++ b/app/views/application/_flash.html.slim
@@ -1,4 +1,4 @@
-#flash-container
+#flash-container.container
   #flash.container.fixed_error_messages data-message-failure=t('shared.message_failure')
     - %w[alert danger info notice success warning].each do |severity|
       div.alert.flash class="alert-#{{'alert' => 'warning', 'notice' => 'success'}.fetch(severity, severity)} alert-dismissible fade show"
diff --git a/app/views/exercises/_editor.html.slim b/app/views/exercises/_editor.html.slim
index 700a9855..7323f21e 100644
--- a/app/views/exercises/_editor.html.slim
+++ b/app/views/exercises/_editor.html.slim
@@ -5,26 +5,29 @@
 - show_rfc_interventions = @show_rfc_interventions || "false"
 - hide_rfc_button = @hide_rfc_button || false
 #editor.row data-exercise-id=@exercise.id data-message-depleted=t('exercises.editor.depleted') data-message-timeout=t('exercises.editor.timeout',  permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-submissions-url=submissions_path data-user-id=@current_user.id data-user-external-id=external_user_external_id data-working-times-url=working_times_exercise_path(@exercise) data-intervention-save-url=intervention_exercise_path(@exercise) data-rfc-interventions=show_rfc_interventions data-break-interventions=show_break_interventions data-course_token=@course_token data-search-save-url=search_exercise_path(@exercise)
-  div id="sidebar" class=(@exercise.hide_file_tree ? 'sidebar-col-collapsed' : 'sidebar-col') = render('editor_file_tree', exercise: @exercise, files: @files)
+  - unless @embed_options[:hide_sidebar]
+    div id="sidebar" class=(@exercise.hide_file_tree ? 'sidebar-col-collapsed' : 'sidebar-col') = render('editor_file_tree', exercise: @exercise, files: @files)
   div.editor-col.col.p-0 id='frames'
     #editor-buttons.btn-group.enforce-bottom-margin
       = render('editor_button', disabled: true, icon: 'fa fa-ban', id: 'dummy', label: t('exercises.editor.dummy'))
-      = render('editor_button', icon: 'fa fa-desktop', id: 'render', label: t('exercises.editor.render'))
-      = render('editor_button', data: {:'data-message-failure' => t('exercises.editor.run_failure'), :'data-message-network' => t('exercises.editor.network'), :'data-message-success' => t('exercises.editor.run_success'), :'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-play', id: 'run', label: t('exercises.editor.run'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + r'))
-      = render('editor_button', data: {:'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-stop', id: 'stop', label: t('exercises.editor.stop'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + r'))
-      = render('editor_button', data: {:'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-rocket', id: 'test', label: t('exercises.editor.test'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + t'))
-      = render('editor_button', data: {:'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-trophy', id: 'assess', label: t('exercises.editor.score'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + s'))
+      = render('editor_button', icon: 'fa fa-desktop', id: 'render', label: t('exercises.editor.render')) unless @embed_options[:hide_run_button]
+      = render('editor_button', data: {:'data-message-failure' => t('exercises.editor.run_failure'), :'data-message-network' => t('exercises.editor.network'), :'data-message-success' => t('exercises.editor.run_success'), :'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-play', id: 'run', label: t('exercises.editor.run'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + r')) unless @embed_options[:disable_run]
+      = render('editor_button', data: {:'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-stop', id: 'stop', label: t('exercises.editor.stop'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + r')) unless @embed_options[:disable_run]
+      = render('editor_button', data: {:'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-rocket', id: 'test', label: t('exercises.editor.test'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + t')) unless @embed_options[:disable_run]
+      = render('editor_button', data: {:'data-placement' => 'top', :'data-toggle' => 'tooltip', :'data-container' => 'body'}, icon: 'fa fa-trophy', id: 'assess', label: t('exercises.editor.score'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + s')) unless @embed_options[:disable_score]
       // todo: check this
-      - if not hide_rfc_button
+      - unless hide_rfc_button
         = render('editor_button', icon: 'fa fa-comment', id: 'requestComments', label: t('exercises.editor.requestComments'), title: t('exercises.editor.requestCommentsTooltip'))
     - @files.each do |file|
+      - file.read_only = true if @embed_options[:read_only]
       = render('editor_frame', exercise: exercise, file: file)
     #autosave-label
       = t('exercises.editor.lastsaved')
       span
       button style="display:none" id="autosave"
-  div id='output_sidebar' class='output-col-collapsed' = render('exercises/editor_output', external_user_id: external_user_id, consumer_id: consumer_id )
+  - unless @embed_options[:disable_run] && @embed_options[:disable_score]
+    div id='output_sidebar' class='output-col-collapsed' = render('exercises/editor_output', external_user_id: external_user_id, consumer_id: consumer_id )
 
 
-= render('shared/modal', id: 'comment-modal', title: t('exercises.implement.comment.request'), template: 'exercises/_request_comment_dialogcontent')
-= render('shared/modal', id: 'break-intervention-modal', title: t('exercises.implement.break_intervention.title'), template: 'interventions/_break_intervention_modal')
+= render('shared/modal', id: 'comment-modal', title: t('exercises.implement.comment.request'), template: 'exercises/_request_comment_dialogcontent') unless @embed_options[:disable_rfc]
+= render('shared/modal', id: 'break-intervention-modal', title: t('exercises.implement.break_intervention.title'), template: 'interventions/_break_intervention_modal') unless @embed_options[:disable_interventions]
diff --git a/app/views/exercises/_editor_output.html.slim b/app/views/exercises/_editor_output.html.slim
index dd6849da..91f289d8 100644
--- a/app/views/exercises/_editor_output.html.slim
+++ b/app/views/exercises/_editor_output.html.slim
@@ -10,17 +10,18 @@ div.h-100 id='output_sidebar_uncollapsed' class='d-none col-sm-12 enforce-bottom
         #results
           h2 = t('exercises.implement.results')
           p.test-count == t('exercises.implement.test_count', count: 0)
-          ul.list-unstyled
-          ul#dummies.d-none.list-unstyled
-            li.card.mt-2
-              .card-header.py-2
-                h5.card-title.m-0 == t('exercises.implement.file', filename: '', number: 0)
-              .card-body.bg-white.text-dark
-                = row(label: 'exercises.implement.passed_tests', value: t('shared.out_of', maximum_value: 0, value: 0).html_safe)
-                = row(label: 'activerecord.attributes.submission.score', value: t('shared.out_of', maximum_value: 0, value: 0).html_safe)
-                = row(label: 'exercises.implement.feedback')
-                = row(label: 'exercises.implement.error_messages')
-                /= row(label: 'exercises.implement.output', value: link_to(t('shared.show'), '#'))
+          - unless @embed_options[:hide_test_results]
+            ul.list-unstyled
+            ul#dummies.d-none.list-unstyled
+              li.card.mt-2
+                .card-header.py-2
+                  h5.card-title.m-0 == t('exercises.implement.file', filename: '', number: 0)
+                .card-body.bg-white.text-dark
+                  = row(label: 'exercises.implement.passed_tests', value: t('shared.out_of', maximum_value: 0, value: 0).html_safe)
+                  = row(label: 'activerecord.attributes.submission.score', value: t('shared.out_of', maximum_value: 0, value: 0).html_safe)
+                  = row(label: 'exercises.implement.feedback')
+                  = row(label: 'exercises.implement.error_messages')
+                  /= row(label: 'exercises.implement.output', value: link_to(t('shared.show'), '#'))
         #score data-maximum-score=@exercise.maximum_score data-score=@submission.try(:score)
           h4
             span == "#{t('activerecord.attributes.submission.score')}:&nbsp;"
@@ -44,12 +45,13 @@ div.h-100 id='output_sidebar_uncollapsed' class='d-none col-sm-12 enforce-bottom
           input#prompt-input.form-control type='text'
           span.input-group-btn
             button#prompt-submit.btn.btn-primary type="button" = t('exercises.editor.send')
-        #error-hints
-          .heading = t('exercises.implement.error_hints.heading')
-          ul.body
+        - unless @embed_options[:disable_hints]
+          #error-hints
+            .heading = t('exercises.implement.error_hints.heading')
+            ul.body
         #output.mt-2
           pre = t('exercises.implement.no_output_yet')
-        - if CodeOcean::Config.new(:code_ocean).read[:flowr][:enabled]
+        - if CodeOcean::Config.new(:code_ocean).read[:flowr][:enabled] && !@embed_options[:disable_hints] && !@embed_options[:hide_test_results]
           #flowrHint.card.text-white.bg-info data-url=CodeOcean::Config.new(:code_ocean).read[:flowr][:url] role='tab'
             .card-header = t('exercises.implement.flowr.heading')
             .card-body.text-dark.bg-white
diff --git a/app/views/exercises/implement.html.slim b/app/views/exercises/implement.html.slim
index 1e872cbf..96f4ff74 100644
--- a/app/views/exercises/implement.html.slim
+++ b/app/views/exercises/implement.html.slim
@@ -1,17 +1,18 @@
 .row
   #editor-column.col-md-12
-    .exercise.clearfix
-      div
-        span.badge.badge-pill.badge-primary.float-right.score
+    - unless @embed_options[:hide_exercise_description]
+      .exercise.clearfix
+        div
+          span.badge.badge-pill.badge-primary.float-right.score
 
-        h1 id="exercise-headline"
-          i class="fa fa-chevron-down" id="description-symbol"
-          = @exercise.title
+          h1 id="exercise-headline"
+            i class="fa fa-chevron-down" id="description-symbol"
+            = @exercise.title
 
-      #description-card.lead.description-card
-        = render_markdown(@exercise.description)
+        #description-card.lead.description-card
+          = render_markdown(@exercise.description)
 
-      a#toggle href="#" data-show=t('shared.show') data-hide=t('shared.hide') = t('shared.hide')
+        a#toggle href="#" data-show=t('shared.show') data-hide=t('shared.hide') = t('shared.hide')
 
     #alert.alert.alert-danger role='alert'
       h4 = t('.alert.title')
diff --git a/app/views/layouts/application.html.slim b/app/views/layouts/application.html.slim
index 64b5549f..cdc3eb4e 100644
--- a/app/views/layouts/application.html.slim
+++ b/app/views/layouts/application.html.slim
@@ -13,22 +13,23 @@ html lang='en'
     = yield(:head)
     = csrf_meta_tags
   body
-    nav.navbar.navbar-dark.bg-dark.navbar-expand-md.mb-4.py-1 role='navigation'
-      .container
-        .navbar-brand
-          i.fa.fa-code
-          = application_name
-        button.navbar-toggler data-target='#navbar-collapse' data-toggle='collapse' type='button' aria-expanded='false' aria-label='Toggle navigation'
-          span.navbar-toggler-icon
-        #navbar-collapse.collapse.navbar-collapse
-          = render('navigation', cached: true)
-          ul.nav.navbar-nav.ml-auto
-            = render('locale_selector', cached: true)
-            li.nav-item.mr-3 = link_to(t('shared.help.link'), '#modal-help', data: {toggle: 'modal'}, class: 'nav-link')
-            = render('session')
-    .container data-controller=controller_name
+    - unless @embed_options[:hide_navbar]
+      nav.navbar.navbar-dark.bg-dark.navbar-expand-md.mb-4.py-1 role='navigation'
+        .container
+          .navbar-brand
+            i.fa.fa-code
+            = application_name
+          button.navbar-toggler data-target='#navbar-collapse' data-toggle='collapse' type='button' aria-expanded='false' aria-label='Toggle navigation'
+            span.navbar-toggler-icon
+          #navbar-collapse.collapse.navbar-collapse
+            = render('navigation', cached: true)
+            ul.nav.navbar-nav.ml-auto
+              = render('locale_selector', cached: true)
+              li.nav-item.mr-3 = link_to(t('shared.help.link'), '#modal-help', data: {toggle: 'modal'}, class: 'nav-link')
+              = render('session')
+    div data-controller=controller_name
       = render('flash')
-      = render('breadcrumbs') if current_user.try(:internal_user?)
+      = render('breadcrumbs') if current_user.try(:internal_user?) && !@embed_options[:hide_navbar]
     - if (controller_name == "exercises" && action_name == "implement")
       .container-fluid
         = yield
diff --git a/app/views/submissions/show.json.jbuilder b/app/views/submissions/show.json.jbuilder
index 07e199f4..b66919dc 100644
--- a/app/views/submissions/show.json.jbuilder
+++ b/app/views/submissions/show.json.jbuilder
@@ -1,8 +1,8 @@
 json.extract! @submission, :id, :files
-json.download_url download_submission_path(@submission)
-json.score_url score_submission_path(@submission)
-json.stop_url stop_submission_path(@submission)
-json.download_file_url download_file_submission_path(@submission, 'a.').gsub(/a\.$/, '{filename}')
-json.render_url render_submission_path(@submission, 'a.').gsub(/a\.$/, '{filename}')
-json.run_url run_submission_path(@submission, 'a.').gsub(/a\.$/, '{filename}')
-json.test_url test_submission_path(@submission, 'a.').gsub(/a\.$/, '{filename}')
+json.download_url download_submission_path(@submission, format: :json)
+json.score_url score_submission_path(@submission, format: :json)
+json.stop_url stop_submission_path(@submission, format: :json)
+json.download_file_url download_file_submission_path(@submission, 'a.', format: :json).gsub(/a\.\.json$/, '{filename}.json')
+json.render_url render_submission_path(@submission, 'a.', format: :json).gsub(/a\.\.json$/, '{filename}.json')
+json.run_url run_submission_path(@submission, 'a.', format: :json).gsub(/a\.\.json$/, '{filename}.json')
+json.test_url test_submission_path(@submission, 'a.', format: :json).gsub(/a\.\.json$/, '{filename}.json')
diff --git a/lib/assets/javascripts/flash.js b/lib/assets/javascripts/flash.js
index d7273864..7e7669a2 100644
--- a/lib/assets/javascripts/flash.js
+++ b/lib/assets/javascripts/flash.js
@@ -1,5 +1,5 @@
 $( document ).on('turbolinks:load', function() {
-  var DURATION = 10000;
+  var DURATION = 5000;
   var SEVERITIES = ['danger', 'info', 'success', 'warning'];
 
   var buildFlash = function(options) {
diff --git a/lib/assets/stylesheets/flash.css.scss b/lib/assets/stylesheets/flash.css.scss
index 0abb6dc9..d339aff2 100644
--- a/lib/assets/stylesheets/flash.css.scss
+++ b/lib/assets/stylesheets/flash.css.scss
@@ -1,6 +1,5 @@
 #flash-container {
   position: relative;
-  top: -21px;
 }
 
 .flash {
diff --git a/spec/concerns/lti_spec.rb b/spec/concerns/lti_spec.rb
index bdc5901e..37bb170f 100644
--- a/spec/concerns/lti_spec.rb
+++ b/spec/concerns/lti_spec.rb
@@ -19,6 +19,7 @@ describe Lti do
     it 'clears the session' do
       expect(controller.session).to receive(:delete).with(:consumer_id)
       expect(controller.session).to receive(:delete).with(:external_user_id)
+      expect(controller.session).to receive(:delete).with(:embed_options)
       controller.send(:clear_lti_session_data)
     end
   end
diff --git a/spec/controllers/submissions_controller_spec.rb b/spec/controllers/submissions_controller_spec.rb
index 6aaf8555..97dd2eb3 100644
--- a/spec/controllers/submissions_controller_spec.rb
+++ b/spec/controllers/submissions_controller_spec.rb
@@ -186,7 +186,7 @@ describe SubmissionsController do
         end
 
         it 'ends with a placeholder' do
-          expect(url).to end_with(Submission::FILENAME_URL_PLACEHOLDER)
+          expect(url).to end_with(Submission::FILENAME_URL_PLACEHOLDER + '.json')
         end
       end
     end
@@ -196,7 +196,7 @@ describe SubmissionsController do
         let(:url) { JSON.parse(response.body).with_indifferent_access.fetch("#{action}_url") }
 
         it "corresponds to the #{action} path" do
-          expect(url).to eq(Rails.application.routes.url_helpers.send(:"#{action}_submission_path", submission))
+          expect(url).to eq(Rails.application.routes.url_helpers.send(:"#{action}_submission_path", submission, format: :json))
         end
       end
     end
diff --git a/spec/views/exercises/implement.html.slim_spec.rb b/spec/views/exercises/implement.html.slim_spec.rb
index fe9ab0d0..1944aa31 100644
--- a/spec/views/exercises/implement.html.slim_spec.rb
+++ b/spec/views/exercises/implement.html.slim_spec.rb
@@ -10,6 +10,7 @@ describe 'exercises/implement.html.slim' do
     assign(:exercise, exercise)
     assign(:files, files)
     assign(:paths, [])
+    assign(:embed_options, {})
     render
   end