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Non-Slip Key Pad, Up to 15,000 Variations, LCD Screen
Timer, Record of Fastest Solution Time, Replay Mode, Low Battery LED Indicator
Storage Pouch, Battery Back-Up for Memory, Last Puzzle Recall, Sound Effect, Auto Shut-Off
Two (2) Levels of Play - Beginner/Expert
Three (3) Levels of Difficulty - Easy/Intermediate/Hard
This game says the Ultimate Numerical Challenge! Fun and Educational game! Requires 3 Triple A batteries (not included) and 2 1.5 button cell batteries (included).
Sudoku 15K The Ultimate Numerical Challenge! eSudoku