diff --git a/js/continuous-server.js b/js/continuous-server.js
index b6207e2..f26d343 100644
--- a/js/continuous-server.js
+++ b/js/continuous-server.js
@@ -680,10 +680,30 @@ function createSnapshot( callback, errorCallback ) {
                               url: 'sim-test.html?url=' + encodeURIComponent( '../../' + snapshotName + '/' + phetioRepo + '/' + phetioRepo + '_en.html' ) +
                                    '&simQueryParameters=' + encodeURIComponent( 'brand=phet-io&phetioStandalone&ea' + validatedParam + '&fuzz&memoryLimit=1000' )
                             } );
+
+                            // fuzz test important wrappers
+                            snapshot.testQueue.push( {
+                              count: 0,
+                              snapshotName: snapshotName,
+                              test: [ phetioRepo, 'phet-io-studio-fuzz', 'require.js' ],
+                              url: 'sim-test.html?url=' + encodeURIComponent( `../../${snapshotName}/studio/?sim=${phetioRepo}&phetioDebug&fuzz&postMessageToParent` )
+                            } );
+                            snapshot.testQueue.push( {
+                              count: 0,
+                              snapshotName: snapshotName,
+                              test: [ phetioRepo, 'phet-io-state-fuzz', 'require.js' ],
+                              url: 'sim-test.html?url=' + encodeURIComponent( `../../${snapshotName}/phet-io-wrappers/state/?sim=${phetioRepo}&phetioDebug&fuzz&postMessageToParent` )
+                            } );
+                            snapshot.testQueue.push( {
+                              count: 0,
+                              snapshotName: snapshotName,
+                              test: [ phetioRepo, 'phet-io-mirror-inputs-fuzz', 'require.js' ],
+                              url: 'sim-test.html?url=' + encodeURIComponent( `../../${snapshotName}/phet-io-wrappers/mirror-inputs/?sim=${phetioRepo}&phetioDebug&fuzz&postMessageToParent` )
+                            } );
                           } );
 
                           // accessible tests
-                          snapshot.accessibleRepos.forEach( function( accessibleRepo ) {
+                          snapshot.accessibleRepos.forEach( accessibleRepo => {
                             snapshot.testQueue.push( {
                               count: 0,
                               snapshotName: snapshotName,
diff --git a/js/sim-test.js b/js/sim-test.js
index 97bb585..c4416c9 100644
--- a/js/sim-test.js
+++ b/js/sim-test.js
@@ -31,7 +31,8 @@ iframe.setAttribute( 'height', '384' );
 document.body.appendChild( iframe );
 
 // Add those two to our query parameters, so we get load/error messages
-iframe.src = options.url + '?postMessageOnLoad&postMessageOnError&postMessageOnBeforeUnload' + ( options.simQueryParameters ? '&' + options.simQueryParameters : '' );
+iframe.src = QueryStringMachine.appendQueryStringArray( options.url,
+  [ '?postMessageOnLoad&postMessageOnError&postMessageOnBeforeUnload', options.simQueryParameters ] );
 
 let hasErrored = false;
 let hasLoaded = false;