Crownshift combines number logic, rotating irregular patches and queen placement. Every row, column and assembled patch needs each number once. Original 6×6/8×8 boards have no fixed boxes; the new 9×9, 16×16 and 32×32 boards also require bold Sudoku boxes. Moving a patch never moves a number or queen.
The original 6×6/8×8 journey has 10,002 puzzles; each new 9×9, 16×16 and 32×32 journey currently has one verified showcase. Puzzles unlock one by one within a journey and load individually. Larger boards use a full overview and enlarged input window. Size and clue count are not human difficulty ratings. Sound and spoken guidance are optional. Wait for Saved before leaving; guest access depends on this browser’s private cookie.
The original 6×6 and 8×8 boards do not have fixed Sudoku boxes. The new 9×9 board has 3×3 boxes, 16×16 has 4×4 boxes, and 32×32 has 4-row by 8-column boxes. Fill every row, column and bold box where present, then build the colored regions from loose patches. Every assembled patch also needs each number exactly once.
Finish the patches to reveal the queen layer. Place one queen in each colored patch, with one per row and column. Queens must not touch, even at a corner; longer diagonals are allowed. The numbers under your queens must also be different, so a queen is not tied to the number 1.
Yes. Use X notes to mark excluded squares without placing a queen. You can add or remove your queens and notes as you reason through the board. Locked starting crowns are clues and cannot be removed or marked. Conflicts highlight competing queens; a red conflict is feedback, not a lost attempt.