Kaodoku is a sudoku style puzzle game that was released specially for IOS devices in 2018. You will see 9 grids with 9*9 blocks on the game screen and these blocks will have different shapes with different mouths or smileys. While few of the blocks will be empty in some grids and you have to find these missing shapes. You will be given some clues to find them out. The in-app purchase in the Kaodoku game gives you the feature to unlock more puzzles. The size and color of these puzzles may be different from the previous one. Kaodoku is an interesting and challenging puzzle game that can be downloaded free from the Apple app store and you must have a mobile phone having an android version of 8.0.0 or more to play the game.