🧩 Takuzu Binary 8×8

<p>The classic eight-by-eight Takuzu grid where balancing suns and moons demands genuine step-by-step deduction. Takuzu Binary 8×8 is a binary logic puzzle (also called Takuzu) where you fill the grid with suns and moons under three simple rules. Under the surface it's quietly training pure logic, balance-counting and pattern elimination. Short rounds and a saved personal best make it easy to pop in for one quick attempt and find yourself still playing ten minutes later. Smooth on slow connections and gorgeous on big screens, it's made to be enjoyed by a worldwide audience. It runs instantly in your browser on phone, tablet or desktop with no download, no install and no sign-up. Beat a personal record and the built-in share buttons let you challenge a friend on WhatsApp or Telegram in one tap. There are no timers forcing you to rush unless the game itself adds one, so you can play at your own thoughtful pace. Controls are dead simple to learn but the depth keeps revealing itself the more you play.</p>

How to play

• Tap a cell to place a ☀️, tap again for a 🌙, once more to clear it.
• Never put three of the same symbol in a row or column.
• Each row and column must hold equal suns and moons.
• Use those two rules to deduce forced cells.
• Fill the whole grid correctly to solve it.

Controls

Tap a cell to cycle it through sun, moon and blank. Use the row and column rules to deduce every square.

Features

• Uniquely-solvable sun & moon grids
• Logic-only — never a guess needed
• Best-time tracking
• Several grid sizes for rising difficulty

FAQ