Windoku Sudoku.
In this version of Sudoku, 4 3x3 blocks are added (highlighted in color), in which the numbers from 1 to 9 should not be repeated.

Geometric Sudoku.
In this puzzle, the numbers from 1 to 9 should not be repeated, not only in every horizontal and every vertical row, but also in every highlighted area.

Classic Sudoku.
On the playing field of the 9x9 puzzle, divided into 81 cells with the numbers already placed, the player needs to fill the empty cells with numbers from 1 to 9 so that they do not repeat in a small square, in horizontal and vertical rows.