Place crowns so that every row, every column and every outlined region holds the same number of them: one in the One crown puzzles, two or three in the bigger ones. Crowns may never touch, not even at a corner.

Controls

• Click a cell to cycle: empty, X, crown. Click twice for a crown.
• When you place a crown, the cells it rules out (its row, column, region and the cells touching it) get an X automatically. Those X's go away if you take the crown off; X's you put in yourself stay.
• Right-click places an X. Drag across cells to mark many X's at once; drag from one of your X's to erase them.
• Hint shows the next step you can work out, names the technique and lights up the cells involved. Press it again (or Fill in) to make that step.
• Keyboard: arrow keys move, Space cycles, X marks, Ctrl+Z / Ctrl+Y undo and redo, H for a hint.

Every puzzle is fair

Each puzzle has exactly one solution, and the built-in solver checks that it can be reached by reasoning alone, with no guessing. Difficulty is set by the hardest kind of reasoning the puzzle needs.

Where it comes from

Crowns is a classic logic puzzle known as Star Battle, created by Hans Eendebak for the 2003 World Puzzle Championship. Here the stars are crowns.