Check local-storage failures gracefully

The problem

Private browsing and browser policies may block storage access.

Practical procedure

Wrap reads and writes in error handling; keep the current session playable without persistence.

Worked scenario

If saving is denied, show a nonblocking message and continue the level instead of crashing.

Acceptance check

Simulate storage exceptions and verify game movement, undo and restart still work.

Apply the method

Use the related interactive tool to try the concept on an inspectable example. Record the starting assumptions and expected result before changing settings, then compare what the tool actually does. Where the result differs, keep the release marked experimental and document the discrepancy.

Further reading: Relevant primary technical documentation. This guide is an educational procedure, not a substitute for independent usability or compliance review.