diff --git a/packages/blockly/package.json b/packages/blockly/package.json
index 98ebc5a1c25..62883cd8669 100644
--- a/packages/blockly/package.json
+++ b/packages/blockly/package.json
@@ -66,8 +66,7 @@
     "minify": "gulp minify",
     "package": "gulp pack",
     "prepareDemos": "gulp prepareDemos",
-    "start": "npm run build && concurrently -n tsc,server \"tsc --watch --preserveWatchOutput --outDir \"build/src\" --declarationDir \"build/declarations\"\" \"http-server ./ -s -o /tests/playground.html -c-1\"",
-    "start:advanced": "npm run package && npx nx run @blockly/dev-tools:build && concurrently  -n server,watch \"npx nx run @blockly/dev-tools:start\" \"npx nx watch --projects=@blockly/dev-tools --includeDependencies -- npm run build\"",
+    "start": "npm run package && npx nx run @blockly/dev-tools:build && concurrently -n watch,devtools-server,core-server \"npx nx watch --projects=@blockly/dev-tools --includeDependencies -- npm run build\" \"npx nx run @blockly/dev-tools:start --no-open\" \"http-server ./ -p 8081 -s -o /tests/playground.html -c-1\"",
     "tsc": "gulp tsc",
     "test": "gulp test",
     "test:browser": "npx mocha --config tests/browser/.mocharc.js",
diff --git a/packages/blockly/tests/playground.html b/packages/blockly/tests/playground.html
index df451996dc2..fc8c32566b4 100644
--- a/packages/blockly/tests/playground.html
+++ b/packages/blockly/tests/playground.html
@@ -534,7 +534,10 @@ <h1>Blockly Playground (<span id="version"></span>)</h1>
 
     <p>
       <input id="show" type="button" value="Show" /> -
-      <input id="hide" type="button" value="Hide" />
+      <input id="hide" type="button" value="Hide" /> -
+      <a href="http://localhost:8080/">Advanced</a> -
+      <a href="playgrounds/web_component.html">Web Component</a> -
+      <a href="multi_playground.html">Multi Playground</a>
     </p>
 
     <form id="options">
diff --git a/packages/plugins/dev-scripts/scripts/start.js b/packages/plugins/dev-scripts/scripts/start.js
index 030a1fe0f34..b6619ffa753 100644
--- a/packages/plugins/dev-scripts/scripts/start.js
+++ b/packages/plugins/dev-scripts/scripts/start.js
@@ -34,6 +34,7 @@ const resolveApp = (relativePath) => path.resolve(appDirectory, relativePath);
 
 const packageJson = require(resolveApp('package.json'));
 const isTypescript = fs.existsSync(resolveApp('tsconfig.json'));
+const options = process.argv.slice(2);
 
 console.log(`Running start for ${packageJson.name}`);
 
@@ -178,6 +179,11 @@ compiler.hooks.done.tap('done', async (stats) => {
 // Read the webpack devServer configuration.
 const serverConfig = webpackDevServerConfig();
 
+// If the --no-open option was passed in, respect it.
+if (options.includes('--no-open')) {
+  serverConfig.open = false;
+}
+
 // Start the dev server.
 const devServer = new WebpackDevServer(serverConfig, compiler);
 devServer.startCallback((err) => {