Nothing you didn’t ask for
No pop-ups, no daily streak begging for your attention, no account. You open it, you play, you close it.
One rule: touch a tile to invert the whole row and column.
Coming to Android.
Every square you touch inverts its entire row and its entire column - the square itself included. Black becomes white, white becomes black.
Where the mask is filled, the board flips. Where it is empty, nothing happens. Do it twice and you are back where you started - which is the whole difficulty.
Tap the same square twice and the board forgets you were ever there. There is no progress bar to inch along - only the pattern, or not the pattern.
Crossing taps flip shared squares twice, canceling out. Order never matters. What matters is which squares you pick-each rewrites the others' effects.
Watch a real level solve itself. Notice how the middle looks like a mess — the pattern only appears on the very last tap. That is the whole game: seeing three moves ahead.
No pop-ups, no daily streak begging for your attention, no account. You open it, you play, you close it.
Every level is checked by a solver before it ships, so the shortest solution is known exactly. Dark and light themes. English and Polish. Works on a plane.