A grid-based logic puzzle
Color each cell black or white… and give your brain a workout.
Get Some Puzzles
Learning
When you launch the game for the first time, a learning sequence introduces the constraints one at a time. Each new rule is shown in a short dialog the first time you meet it, and the game then keeps offering puzzles centered on that rule until you have played enough of them (5 puzzles by default) before moving on to the next one. You can skip the whole sequence at any time with the "Skip learning" button in the rule dialog, or restart it from scratch from the Settings page.
The Learning page, reachable from the main menu, lists every constraint with its description and the date you first met it. The "Refresh my memory" button next to each rule launches a short playlist of puzzles centered on that rule — handy to come back to a constraint you have not seen in a while.