TriZen will recognize when the puzzle is completed. Play for a few minutes, or a few hours! Features: - More than 500 puzzles - Over 50 Game Center achievements - Various difficulty levels, with 4-12 piece puzzles - Hint system - Solve puzzles in any order - Shake your device to reset your current puzzle - Track your progress, with a full view of all your completed puzzles - Soothing background music by Atomicon