Puzzle Games Sudoku Edition - Nintendo DS Also plays on Nintendo 2DS and Nintendo 3DS systems. Unlimited number of puzzles - virtually infinite number of puzzles, thanks to an internal algorithm that randomly generates puzzles. Four grid layouts: 9 by 9, 8 by 8, 6 by 6, and 4 by 4. Uses touch screen and stylus. Multiple difficulty selections, including sections for younger players. Use erasable pencil marks to help solve the puzzle. Built-in Sudoku Solver - manually input any puzzle from any other source and solve the puzzle.