The expansion "Der verzauberte Frosch" is only available in this bigbox-edition. The box was exclusively sold by German supermarket chains Real and Kaufhaus, but has been available through other online-shops once in a while.
The expansion contains three wooden pieces (frog and two mushrooms) as well as six "frog-tokens". Before the game, the frog is placed openly by the magician's player. The Robin-player has to decide if he searches for the key near or far from the frog, for his main goal is still finding the key. But upon reaching the frog, he is granted a frog-token, giving him a special moves once in the game.