Terms of Service

Last updated: 7 November 2026

Playing

Free, with no purchases, no paywall and no sign-up. Thirty levels open in order. Tap a highlighted cell to rotate or place a mirror; Shift or Ctrl with a click removes one. Z undoes, R resets, H hints, N moves on. There is no single solution: one beam often has several routes into a receiver, and the hint only names the cell that is still wrong, not which way to turn it.

Ownership

The name, the code, the tuning, the copy and the look belong to GameStrategists. Links, recordings, streams, walkthroughs and a few quoted screenshots are welcome; please do not mirror the whole site, and do not claim you made it. Third-party names and trademarks mentioned belong to their respective owners.

Scores and saves

Cleared state and the fewest moves for all 30 levels are written only in this device's browser, under the namespace gs:zheguang:. There is no server copy, so we cannot restore, migrate or verify a record for you.

Availability

The game is provided as is, with no promise that it will never go down. Maintenance, deployments or a hosting fault can make the page unreachable for a while, and frame rate varies between browsers and devices.

Third parties

The page loads the Google AdSense script to cover the domain and hosting. There are no ad slots inside the game frame and ads never cover the controls. How data is handled is set out in the privacy policy.

Changes

Tuning, levels and page copy may keep changing, and those changes are logged on the hub site. If these terms change in substance, the date at the top of this page changes with them.