This puzzle consists of nine differently-sized rectangular prisms, each of which has numbers from 1 to 54. In order to solve the puzzle, the pieces must be assembled such that the numbers on each face add up to 100.
Designed by Georg Pfäffinger and made in Beech by Philos. Philos is a German puzzle manufacturer that started in 1996 as a manufacturer and distributor of toys. They make a wide variety of wooden puzzles, as well as some less common strategy games, playing cards, and dice.