A grid-based logic puzzle
Color each cell black or white… and give your brain a workout.
Get Some Puzzles
Custom puzzles
Generating puzzles
Open the menu and tap "Generate" to make new puzzles on the fly. Pick the grid dimensions, the constraint types to include or exclude, a time limit per puzzle, and how many puzzles to produce. Choose the playlist that will receive them, then tap "Generate" — the progress bar shows how many have been made. Generation runs in the background; you can stop early at any time and keep what has been produced so far.
Creating puzzles
Open the menu and tap "Create" to design your own puzzle by hand. Pick the grid dimensions and tap "Start" to enter the editor. Tap a cell to open a menu that lets you fix it black or white, or attach a constraint centered on that cell; the added constraint appears, and you can tap it to remove it. The app tries to solve the puzzle as you make changes. Cells with a green border can be found by direct reasoning, those with an orange border by elimination. The bottom bar shows the current dimensions, the number of constraints, and a rough difficulty score. "Test" lets you play through the puzzle to check it works, and "Save" stores it in the chosen playlist.
Playlists
Generated and created puzzles are saved to playlists. The default playlist is "My puzzles", but you can create your own playlists from the Open page. You can also import puzzles from a file.