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Tessellate
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Light every tile. Every tap changes its neighbours too.
About
A five by five grid of dark tiles. Tapping one lights it — and flips the four tiles touching it.
That is the whole rule, and it is enough to make a mess of things in three moves. Work backwards from the corners and the board gives way faster than it looks.
Every board is generated from a solved state, so each one is always solvable. Reset restarts the current board; New board deals a fresh one.
How it was made
Plain HTML and CSS for the grid, with the board generated by shuffling a solved state so it can never be dealt unsolvable.
