Der verzauberte Turm (Metallbox) is a down-scaled version of the big children's game Der verzauberte Turm.
The mage has locked the princess in a tower, and Robin tries to find the key the mage has hidden first and find the correct key hole before the mage does.
The metal box version of the game features a smaller board and the technical mechanic of collecting a key and the mechanic of the key locks have been changed from the big one, getting the game to fit into a much smaller box and being sold at a much cheaper price.
Other differences:
Less spaces to hide the key (12 instead of 16)
Magician has to cover 6 spaces before entering the board (instead of 7)
The tower has 5 keyholes instead of 6
End game condition for magician is different. Instead of freeing the princess, magician takes the key token and another round is played. Magician wins after winning all 5 rounds.
—user summary