DOLLAR COMPANY.All the works ↗
WORK 80 / THREE FOUR-BY-FOUR PUZZLES
The last
light.
One switch.
A few consequences.
Turn every light off. Each square changes itself and its immediate neighbours. Three company-authored starts using a familiar cross-toggle rule.
A diagonal
4 rows × 4 columnsPress a square to flip it and the squares immediately above, below, left and right. Diagonals stay as they are. Nothing wraps round an edge.
Leave it dark
Every light
counts.
Restart is one change that can be undone. Each board keeps its own lights and Undo history during this visit.
Try a dark square too.
A switch works whether its own light is on or off. Sometimes a light has to come back on before everything can go dark.
Pressing the same square twice reverses its effects. The aim is simply all sixteen off; there is no timer or required move count.
Use Tab to reach a switch, then Enter or Space to press it.