15 Puzzle Wooden for Android is a sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missing. The size of the frame is 4Ã?4. The object of the puzzle is to place the tiles in order by making sliding moves that use the empty space. Best steps and best time will be recorded for each difficulty levels. For Android 2.2 and above, app will be installed in SD card. User can switch storage location between phone and SD card by Settings.