How to Solve Heyawake Puzzles
Color the specified number of cells in each region. Empty cells must form a single contiguous group.
How to Solve Hitori Puzzles
Find and shade all duplicate numbers in rows and columns, leaving only unique digits. No shaded cell may be adjacent to another, and unshaded cells must form a contiguous area.
How to Solve LITS Puzzles
Place one tetromino in each region such that all of them are orthogonally contiguous, no tetrominoes of the same type are adjacent, and no 2×2 area of cells is covered.
How to Solve Nonogram Puzzles
Create a picture in the grid using number clues on the top and left edges. They indicate contiguous groups of cells in that row or column, separated by at least one empty cell.
How to Solve Paint by Pairs Puzzles
Link identical pairs of numbers with a number of cells equal to that number, including the start and end cells. Fill in those links to form a picture.
How to Solve Retrograde Battleships Puzzles
Fill in the correct ship segments to place a fleet so that no two ships touch each other.
How to Solve Snake Puzzles
Use the clues to uncover the body of a snake, given the location of the head and tail. The body is a 1-cell wide path that travels only in orthogonal directions and may never touch itself, even diagonally.