Find the Secret Numbers using the clues Clever challenges to explore numbers, sharpen your logic, and learn while having fun? Yes, it's possible! Secret Numbers offers 48 challenges divided into 4 levels of difficulty. Each challenge offers 5 logical clues that will help you find the secret number. 42 number cards are placed on the table. The player(s) choose a challenge from among the 48. Each challenge offers 5 logical clues that eliminate number cards until only one remains. That is the secret number. The game can be played solo, cooperatively, or competitively. In the latter case, two teams compete to find the secret number before the other.