What is Star Battle?

Star Battle, also known as Two Not Touch, is a logic puzzle played on a grid of coloured regions. Twin Stars gives you three new Star Battle boards every day, free, with no account.

1. Place two stars in every row, every column and every coloured region.
2. No two stars may touch, not even corner to corner.
3. Every board has exactly one solution, and it can always be reached by logic. You never need to guess.

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What is Star Battle?

Star Battle is a logic puzzle played on a square grid divided into coloured regions. You place two stars in every row, every column and every region so that no two stars touch, not even diagonally. Each puzzle has exactly one solution.

Is Star Battle the same as Two Not Touch?

Yes. Two Not Touch is the name The New York Times uses for the two-star version of Star Battle. The rules are identical: two stars in each row, column and region, and no stars touching.

Can every board be solved without guessing?

Every Twin Stars board can. Each one is checked by a solver that only uses logical steps a person could follow, and a board is only published if that solver finishes it and the solution is the only one.

Why two stars?

With one star per row, column and region the puzzle is quick and close to other "one per line" puzzles. Two stars makes the no-touching rule matter far more, because stars compete for space inside every region, and that is what produces the deeper deductions Star Battle is known for.