From the box: CRUX 25 consists of a game board and twenty-five high quality plastic pieces. Alone or with other players this game will fascinate you right from the beginning as you try to put down the twenty-five pieces on the game board. Caution! You might have to use all your abilities to solve the mystery of CRUX 25. CRUX 25, super training for your concentration and cleverness. The ultimate aim of the game is to put all of the 25 pieces on the game board. Colour and size of the game pieces have no influence on the solution of the game.