This piece is a mathematical puzzle consisting of 25 wooden blocks. Each block is a 1.75-inch cube, with each face of each block painted uniquely. The blocks are loose (not glued or connected), allowing them to be freely arranged and played with.

Two of the sides display a mathematical visualization of the prime factorization of the first 25 integers, where each wooden block represents a number between 1 and 25. Each symbol represents a prime number or prime factor. The goal of the puzzle is to place the blocks in the correct order by determining which symbol represents each prime number.