If you play with the colored side of the pegs, it's a 2-person game - Tic-Tac-Toe. If you play on the number page of the pegs, there are a few math puzzles to solve. One of the math tasks is to try to make the pins 1 through 9 on the board in each row, column and diagonal make a total of 15. Another is to add a different number to each row, column and diagonal, so it can not be duplicated. Yet another is to place them so that each row and column is the square of an integer. There are 7 other math puzzles that can be made on paper with the numbers 1-9. A nice item for the advanced middle school or early high school student.