Patchwork

Rules — step by step

1. Goal: Identify all selected squares on the 5×5 board so every given clue is satisfied.
2. Board parts: Each square belongs to a "part" (a number printed in the top-left of the cell). Parts can repeat across the board.
3. Row clues (left of each row): If a number is shown, it equals the number of distinct parts in that row that contain at least one selected square. (If a part appears multiple times in the row, it counts only once if any of its squares are selected.)
4. Column clues (above each column): Same as rows, but applied top→bottom in each column: the clue counts distinct parts that have at least one selected square in that column.
5. 2×2 intersection clues: A clue placed at a grid intersection (between four cells) shows how many squares are selected inside the 2×2 block whose top-left corner is that intersection. A dash (empty badge) means there's no clue for that 2×2.
6. Marking selections: Click a cell to toggle selection. Selected cells show a centered marker (circle or cross) so the part color remains visible. Switch marker style with the Marker buttons.
7. Verify & reset: Press Check to verify your current markings against the clues. Press Reset to clear all selections.
8. Winning: You win when all visible row, column and 2×2 clues match the current selections.