GAME FEATURES - 3 Variations of puzzle sizes ( 4x4 , 6x6 , 9x9 ) - 10 Colorful themes to personalize your puzzle loving personality. - Use Pencil Marks to help remember different number possibilities. - Cell Assist feature to help you get through the tough spots. - Enhance Puzzle Grids - Arcade Style Sounds - Pause, Resume, & Restart puzzles with ease. - Fastest times tracked for individual players. - Game Center Integration AVAILABLE PUZZLE PACKS TRAINING PACKS - Trainee Pack (Entry Level 4 X 4) - Apprentice Pack (Variation 6 X 6) SUDOKU PUZZLE PACKS - Tenderfoot (Easy 9 X 9) - Skillful (Moderate 9 X 9) - Arduous (Hard 9 X 9) - Wizard (Expert 9 X 9)