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🟡 Duo

Suns and grapes, half and half, never three in a row.

How to play

  1. Fill every cell with a sun (yellow circle) or a grape (purple square).
  2. Every row and every column has as many suns as grapes.
  3. Never three of the same next to each other, across or down.
  4. No two rows are the same, and no two columns.
  5. Tap a cell to go from sun to grape to empty. Grey cells are given.

More brain breaks

⭐StarsOne star in every row, column and colour patch. Simple rules, real thinking.🧶TrailOne line through every cell, passing the numbers in order.🎲SixSudoku on a 6 × 6 grid: quick to start, tricky to finish.

Questions

What is Duo?

Duo is a Takuzu, also known as Binairo or the binary puzzle, a classic logic puzzle. Every board has exactly one answer.

Is it free?

Yes. Every puzzle and every level is free to play in your browser, with no account and nothing to download.

How many levels are there?

10,000 per game, from gentle small boards to expert ones, plus a new daily puzzle. Every puzzle has exactly one answer, so it can always be solved by reasoning.

Is there a new puzzle every day?

Yes: one per game, the same for everyone, gentle on Monday and hardest at the weekend. Solve it to keep your streak going.

Where is my progress kept?

In this browser only: your streak, solved levels and an unfinished puzzle. Nothing is sent to us, and there is no account. Another browser or a private window starts fresh.