One crown in every row, every column and every colour.
No two crowns may touch — not even at the corners.
Tap once to rule a square out, twice to crown it.
Every row, every column and every colour block needs exactly one crown, and no two crowns may touch — not even at the corners. Tap a square once to rule it out, twice to crown it. Solve the board and the next one is bigger; there are no difficulty modes to pick.
Ruling squares out is the real move, not crowning them. Take the colour block with the fewest free squares and mark everything its crown would attack; do that two or three times and a square usually appears that nothing else can use. Crowns touching diagonally is the rule people forget, and it is the one that quietly makes a board unsolvable.
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