you might be able to sell it

The puzzle is part of Heye's Cartoon Classics series

The game comes with 55 round cards

The designers at Huzzle have collected several metal puzzles from that era at flea markets

Sleeping Gods: Dungeons exp. Hjernevrider - Metal - Niveau 2 you might be able toSleeping Gods: Dungeons is an expansion for Sleeping Gods that adds 6 dungeons to the game. Each dungeon comes with a story and a postcard sized map. A booklet contains all the descriptions, encounters and puzzles you can experience throughout the game. You access these dungeons at specific locations in the atlas in the original Sleeping Gods game and if you choose to explore a dungeon, the rules of the game change slightly, as a dungeon takes longer