Place exactly one crown in every row, every column, AND every colored
region - all three at once.
Two crowns can never touch, not even diagonally.
Tap an empty cell to mark it as definitely empty (a bold X, handy for ruling cells out) - you can also
drag across several cells to mark or clear a whole stretch of X's at once. Tap an
X-marked cell (a single tap, not a drag) to place the real
crown there instead, and tap a placed crown to
clear it back to blank.
Any rule you break - two in the same row/column/region, or two touching - is flagged red the instant it
happens.
Undo / Redo step backward or forward. Hint places one correct cell for
you (limited per puzzle, costs points). Pause hides the board and stops the timer.
Pick a different icon theme any time with the row of buttons above the board - it's just a reskin, the
puzzle underneath never changes.
