PHCASH

Explore Castle Lights. Tap a window to toggle its light and its four neighbors. Turn every window dark to complete a challenge. Each board is generated using valid toggles, so a solution exists. Three difficulty settings change the initial pattern complexity. Follow your moves and time, and keep completed-challenge counts and best scores locally.

Play offline without an account. No ads, in-app purchases or subscriptions. The interface is in English. Progress is stored on your device. Pause during a challenge, resume when ready, or start a new board.