For fans of the Sudoku puzzle, Sudoku X will be a real gift. It's not for beginners, although it's worth a try. Even at the simple level, tough conditions await you. You are given three prompts and three opportunities to erase the value you set in the box. In addition to simple, there is a level of medium difficulty and the last one is for professionals. They differ in the level of filling the field with numbers. The more difficult the level, the fewer numbers will remain in the cells, which means you will have to set more values. The conditions of Sudoku are simple - do not allow numbers to be repeated horizontally and vertically. And also in separate square blocks of the game Sudoku X.