100 Number Puzzles. Ages 8 & Older. This is a Fun, Reasoning, Mathematical, Game Of Deduction. There are 4 skills levels included: Easy, Medium, Hard, & Master. If you like Sudoku, you're going to love CODE 34. These puzzles also provide a fun & enjoyable method of teaching math. See if you can Master Code 34! Check out the PREVIEW to see how the game is played.