Sovereigns
Place a crown in every row, column, and colored region with no two touching.
Place exactly one crown in every row, every column, and every colored region — no exceptions and no repeats.
Two crowns may never touch, not even diagonally — corner-to-corner counts as touching too.
Tap a cell once to mark it with an X (crown can't go here), tap again to place a crown, and a third tap clears it. Use X to rule out cells as you deduce the solution.
Crowns that break a rule are highlighted immediately so you can spot the conflict.
Hint places one correct crown but counts against your score. Undo/Redo step through your move history.
Given the regions, there is always exactly one valid arrangement. Practice mode lets you pick a 6×6 or 8×8 board; the daily puzzle is 8×8 for everyone.