Logic · LIGHTS
Ring Lights
Toggle only the four orthogonal neighbours; the chosen light stays unchanged.
Setting out the board…
Toggle only the four orthogonal neighbours; the chosen light stays unchanged.
Checking saved data…
PLAYFIELD BUILD NOTES
Why this variation is here
This logic variation is authored to make one rule visible at a time. The board state is deterministic for a round, and the shell keeps undo, restart, and keyboard focus close to the decision.
Source
Playfield-authored code and local assets.
Controls
Keyboard and touch instructions are shown above the game.
Data
Progress stays in this browser; no account is required.