Takuzu

Fill the grid with two symbols following three simple rules.

How to Play

Fill every empty cell with either a filled circle (●) or an open circle (○) so that the grid satisfies three rules:

1. No triple: No three consecutive identical symbols in any row or column.
2. Equal count: Each row and column must contain exactly N/2 of each symbol.
3. Unique lines: No two rows may be identical; no two columns may be identical.

Pre-filled cells (shown in bold) cannot be changed. The puzzle is solved when every cell is filled and all three rules are satisfied.

Controls

Key	Action
Arrow keys / WASD / hjkl	Move cursor
Mouse left-click	Move to a cell, or cycle the current editable cell
z / 0	Place ●
x / 1	Place ○
Backspace	Clear cell
Ctrl+R	Reset puzzle
Ctrl+H	Toggle full help
Escape	Return to main menu

Modes

Mode	Grid	Clues	Techniques Required
Beginner	6x6	~50%	Doubles and sandwich patterns
Easy	6x6	~40%	Counting required
Medium	8x8	~40%	Moderate deduction
Tricky	10x10	~38%	Uniqueness rule needed
Hard	10x10	~32%	Long deduction chains
Very Hard	12x12	~30%	Deep logic required
Extreme	14x14	~28%	Maximum challenge

Quick Start

puzzletea new takuzu beginner
puzzletea new takuzu medium
puzzletea new takuzu extreme
puzzletea new binairo hard       # alias