Popular Sudoku Variants, Explained Simply

The idea behind a variant

Every Sudoku variant keeps the heart of the game: fill a grid so that each value appears once in every group. A variant simply adds a new group, a new constraint or a new size. Learn the classic first, and every variant becomes easy to pick up.

X-Sudoku, also called Diagonal

This one adds two extra groups: the two main diagonals must also contain each value exactly once. Those diagonals give you extra deductions the classic board does not have, and they often provide the key move on a hard puzzle.

Hyper, also called Windoku

Hyper Sudoku draws four extra shaded 3 by 3 regions inside the grid, each of which must also hold every value once. The overlapping regions create a dense web of constraints, so a Hyper board can feel tighter and more interlocked than a classic one.

Killer

Killer Sudoku replaces given numbers with dotted cages that each carry a target sum. The values in a cage must add to the target with no repeats. It mixes a little arithmetic into the logic and usually starts with an empty grid.

Samurai and other giants

Samurai Sudoku joins five overlapping grids into one big flower shape, where the corner boxes are shared. Solving one grid feeds clues into its neighbors, so a Samurai is really five puzzles that lean on each other. Other oversized boards use 16 by 16 grids with values 1 to 16.

Mini Sudoku for a quick game

Mini boards shrink the grid to 4 by 4 or 6 by 6 with smaller regions. They solve in a minute or two and are perfect for young players or a short break. Because the rules are identical, they are the gentlest way to learn.

Shapedoku itself is a variant at heart. It keeps every classic rule and swaps the numbers for nine shapes, which makes the board easier to read while the logic stays exactly the same. Try a game and you will feel right at home.