Plays in your browser, on your phone or computer. Nothing to install.
Description
Zeros and ones, three rules and no luck: a calm puzzle for your phone.
Three rules. Never three of the same in a row, as many zeros as ones in every row and column, and no repeated rows or columns. You learn them in ten seconds.
No guessing. Every grid has exactly one solution and can be solved entirely by reasoning. If you get stuck, the hint fills in the next cell and explains which rule forces it, so you learn to spot it yourself.
Three modes. Classic (Easy 6×6, Medium 8×8, Hard 10×10 and Expert 12×12), a Daily challenge with the same grid for everyone each day, and Zen, with no timer.
Genuinely calm. No ads, no purchases and no accounts. Your games, stats and achievements stay on your device.
For everyone. Round zeros and square ones, as well as different colours, so you can tell them apart without relying on colour. Dark, light and high-contrast themes, left-handed controls and a reduce-motion option. In Spanish, Catalan and English.
