Logic · LIGHTS
Row & Column Lights
Toggle the union of the chosen row and column, counting the chosen cell once.
Setting out the board…
Toggle the union of the chosen row and column, counting the chosen cell once.
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.