Zero or One: Binary Puzzle

Two digits, simple rules, satisfying deductions. Zero or One is a binary logic puzzle in the Takuzu and Binairo family. Fill each grid with 0s and 1s, read the patterns and work out what belongs in the next cell.

LEARN THE LOGIC
Each row and column needs an equal number of 0s and 1s. Three identical digits can never sit consecutively, horizontally or vertically. From campaign level 61, a third rule joins the challenge: no two rows, and no two columns, may be identical.

An interactive 4x4 tutorial introduces the rules one at a time. Blue and orange tiles also show the digits, so you can follow patterns by both color and number.

600 LEVELS TO EXPLORE
Progress through 50 worlds with grids from 4x4 to 12x12. Start with small boards and discover more demanding deductions as the campaign introduces larger grids and new techniques.

YOUR DAILY CHALLENGE
Return to the daily puzzle and build your streak. The weekly difficulty rises from Monday to Sunday. For more practice, choose one of five difficulty levels in Endless mode.

HELP THAT EXPLAINS
Use hints with explanations and highlighted cells to understand the reasoning behind a move. Undo a step when you want to reconsider, and resume saved games when you return.

Collect stars and achievements as you progress, and choose a light or dark theme. Whether you are learning binary puzzles or ready for a 12x12 grid, Zero or One gives you room to think at your own pace.