Planet Sudoku is described as 'Sudoku puzzles for kids to experts, including 9x9 Sudoku, Samurai Sudoku, 25x25 Sudoku, 4x4 Sudoku, 6x6 Sudoku, 8x8 Sudoku, 12x12 Sudoku, 16x16 Sudoku, 20x20 Sudoku, Multi 2 Sudoku, Multi 4 Sudoku, su Doku, and su do ku puzzles. No installs, no plugins, no flash needed' and is an game in the games category. There are more than 25 games similar to Planet Sudoku for a variety of platforms, including Android, Windows, Android Tablet, iPad and iPhone apps. The best Planet Sudoku alternative is Open Sudoku, which is both free and Open Source. Other Planet Sudoku like games are USB Sudoku, Sudokuplus.net, Simple Sudoku and Sudoku by Pink Pointer.