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KenKen is a grid-based game similar to Sudoku. The main difference is that KenKen requires arithmetic to solve. The aim is to fill in the blank cells in a grid using only certain numbers. For example, in a 44 grid, you can only use numbers 1, 2, 3, and 4.

Product details. Jigsaw Sudoku, known as Geometric Sudoku shares the same rules as a regular Sudoku puzzle, with the only difference being the fact that Jigsaw Sudoku has irregular shaped blocks as opposed to the 3x3 square blocks in a regular Sudoku puzzle.