Sudoku 6×6
Fill each row, column, and 2×3 box with 1–6.
Sudoku 9×9
Place 1–9 once in every row, column, and 3×3 box.
Thermo Sudoku
Digits rise along thermometers plus standard Sudoku rules.
Nonogram
Use row and column clues to reveal a pixel picture.
Cross Sums
Fill runs to match their sums with no repeated digits.
Loop Path
Draw one continuous loop to satisfy the cell counts.
Codebreaker
Crack the hidden code using feedback after each guess.
Word Ladder
Change one letter per step to reach the target word.
Dapli
Drag domino tiles to hit overlapping region sums.