diff --git a/src/main.js b/src/main.js
index 31794c5..5e62992 100644
--- a/src/main.js
+++ b/src/main.js
@@ -157,6 +157,7 @@
       const parsed = parseInt(raw, 10);
       return Number.isFinite(parsed) ? parsed : 0;
     } catch (err) {
+      console.error("Failed to load high score", { sceneId, err });
       return 0;
     }
   };
@@ -167,6 +168,7 @@
       const parsed = parseInt(raw, 10);
       return Number.isFinite(parsed) ? parsed : 0;
     } catch (err) {
+      console.error("Failed to load longest chain", { sceneId, err });
       return 0;
     }
   };
@@ -175,7 +177,10 @@
     try {
       localStorage.setItem(makeStorageKey(currentScene.id), String(highScore));
     } catch (err) {
-      // ignore write failures (private mode or blocked storage)
+      console.error("Failed to save high score", {
+        sceneId: currentScene.id,
+        err,
+      });
     }
   };
 
@@ -186,7 +191,10 @@
         String(longestChainRecord),
       );
     } catch (err) {
-      // ignore write failures
+      console.error("Failed to save longest chain", {
+        sceneId: currentScene.id,
+        err,
+      });
     }
   };
 
@@ -651,6 +659,12 @@
       if (chainLength > longestChainRecord) {
         longestChainRecord = chainLength;
         saveLongestChain();
+        console.log(
+          "New longest chain record",
+          chainLength,
+          "scene",
+          currentScene?.id,
+        );
         ui.showFloatingMessage(`New chain record: ${chainLength}`, {
           durationMs: 3600,
           position: config.messages.position,