A logic puzzle for iPhone & iPad

Two forms.
One puzzle.

Filled or hollow? A few simple rules turn an empty grid into a satisfying little win.

App Store release in preparation.

A little logic. A lovely little click.

Simple rules. Plenty to discover.

Find the balance.

Every row and column needs the same number of filled and hollow circles.

Don’t let three matching circles sit together, horizontally or vertically.

An = means match; a × means different. Completed rows and columns must also be unique.

Play at your pace

Choose from four board sizes, from a quick 4 × 4 to a roomier 10 × 10. Come back for a daily challenge, or keep going in your favorite difficulty.

Stuck? A hint explains the next move before you decide whether to fill the cell. Keep the timer on, or turn it off and take your time.

Free to play with ads. An optional one-time purchase removes ads and includes unlimited hints.

Find help with hints, progress and purchases.