GridDuel: Sudoku & Friends

GridDuel is a clean and focused Sudoku game for solo play, daily puzzles, and friendly competition. Create an Arena, choose a separate difficulty for each of its three rounds, and invite a friend through Game Center. Both players can solve the same puzzles at the same time and at their own pace. A friend's detailed result is revealed only after you finish the same round. For a completely offline competition, create a classic challenge and share its short code. Entering the code generates the exact same Sudoku on both phones without a server. WHAT YOU GET • Five difficulty levels, from Beginner to Expert • Three-round Game Center Arenas for two players • A separate difficulty for every Arena round • Simultaneous play with per-round and overall results • Friend challenges using a short shareable code • A daily Sudoku with the same puzzle for everyone • Fully offline solo play • Notes, erase, pause, and related-cell highlighting • Three hints for every game • Completed-game statistics and best score • English and Czech based on your iPhone language Speed is not the only thing that matters in a duel. Mistake penalties escalate from 30 to 60, 90, 180, and then 360 seconds, while every hint adds 60 seconds. The fastest accurate solver wins. GridDuel requires no custom account. Solo games, daily puzzles, and code challenges work without internet access. Arenas require an internet connection and a Game Center account.