Shoal Sudoku is a captivating iPhone game that brings the classic Japanese puzzle experience to your fingertips. With over 25,000 puzzles available, players can enjoy endless challenges. The game offers four difficulty levels - Easy, Medium, Hard, and Expert - catering to both beginners and seasoned Sudoku enthusiasts.

One standout feature of Shoal Sudoku is its unlimited undo/redo support, allowing players to rectify mistakes without any constraints. Additionally, the ability to manually input any Sudoku game for play adds a personal touch to the gameplay experience. Dive into the world of Sudoku with Shoal Sudoku and test your puzzle-solving skills today.