Flip Tiles
Click a tile — it and its four neighbors flip. Goal: all on.
Level
1
Moves
0
Best
∞
How to play
Click a tile and it, together with its four orthogonal neighbors (up/down/left/right), flips (on becomes off, off becomes on). Goal: turn the entire board on.
This looks random, but it's actually a linear algebra problem — formally, "linear equations over GF(2)." Of all 32768 states on a 5x5 board, only 1024 are solvable; but our generator starts from the solved state and works backward, so every puzzle is solvable.
Hint
Don't click randomly. The standard solve goes row-by-row top to bottom. Observing the first row lets you predict downstream states.
Inspiration
Tribute to Tiger Electronics' Lights Out (1995). Fully original implementation here; visuals and levels are BverGame original.