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Fill every square with a dot or a ring. Tap a square once for a dot, again for a ring, a third time to clear it. Dark squares are given.

Balance: every row and column has as many dots as rings.
No three: never three of the same in a row or column.
All different: no two rows, and no two columns, are identical.

A worked example

Take this row. Two dots sit side by side, and there are rings further along.

Step 1. A third dot next to the two dots would make three in a row, so the third square must be a ring.

Step 2. The row now has two dots and three rings. It needs three of each, so the last empty square is a dot.

Every square was forced by a rule, so you never need to guess.

Every puzzle has exactly one answer and can be solved by logic alone. Rule breaks turn the squares red as you play. A hint adds 15 seconds. Use the arrow keys and Space if you prefer the keyboard.

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A worked example

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