diff --git a/web/index.html b/web/index.html
index 0b18f18..0c7170a 100644
--- a/web/index.html
+++ b/web/index.html
@@ -100,7 +100,9 @@
     </script>
     <script src="picker.js"></script>
     <script>
-      MRPArcade.init({
+      // The arcade picker is optional chrome: a standalone deploy without
+      // picker.js still boots the baked game.
+      if (typeof MRPArcade !== 'undefined') MRPArcade.init({
         engine: 'mrpci',
         ready: () => typeof wasm_exports !== 'undefined' && !!wasm_exports,
         load: (json) => sendBundleToEngine(json),