A video game and its variants. The basic idea is there is a grid of clickable lights. Clicking one changes it from on to off or vice versa, but it also toggles the orthogonally adjacent lights. This appeared as a puzzle in the World Puzzle Grand Prix called Buttons, with additional restrictions on which ones you can click.
Also called: Buttons (WPC Puzzle)
Puzzles
MIT Mystery Hunt 2023 Conjuri's Request
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