Bidoku

Bidoku is a sudoku-like puzzle. 

Controls

Tap a cell once to place ✖️, tap it again to change to ⭕, and once more to clear it.

Goal

Fill every cell with ✖️ or ⭕.

But follow these rules:

1. No Threes. Never place three identical symbols in a line — across or down. (⭕⭕✖️ is OK ✓, but ⭕⭕⭕ is forbidden ✗)
2. Balance. Each row and each column must have equal numbers of ✖️'s and ⭕'s.
3. No Duplicates. Every row must be unique. Every column must be unique.

There is exactly one solution — and you can reach it through pure logic. No guessing needed.

Stuck? Use Hints — they will point you to a cell where logic can make progress.

Red cells indicate a rule violation.

Play on itch.io or here: https://bidoku.pages.dev/ 

Features

• Endless level generator from 4×4 to 12×12 grids
• Rectangles, diamonds, and crosses — board shapes you won't find in other binary puzzle games
• Hint system that teaches you cool tricks as you play
• Autosolver — paste any binary puzzle from other source and get the solution
• Like puzzles and share them with friends via link
• Play on desktop and mobile, in any browser