Sudoku, logic games, and puzzles are not only great for killing time but can give your brain a workout. Blockudoku for iPhone is a combination of Sudoku and block puzzle games that offers you daily challenges. The aim is to drop blocks on a 9×9 grid, match them to score and complete square to keep the board clean. You can score more combos and streaks.
This game lets you compete against others in tournaments. There are also daily challenges for you to try. You can also customize the theme for this game. Blockudoku is available as a free download with paid in-app add-ons.[where to get it]