Conceptis MultiSudoku: Multi-grid Sudoku for iPhone
Sudoku is a wonderful puzzle game that can keep your brain sharp. Conceptis MultiSudoku is a multi-grid Sudoku game that takes it to the next level. It comes with 2-grid to 5-grid puzzles. This app comes with over 70 sample puzzles to test you. It has multiple difficulty levels for your puzzles.
Conceptis MultiSudoku lets you play and save multiple puzzles concurrently. It lets you do unlimited undos and redos. This app saves your progress to iCloud. It is available as a free download with in-app purchases.