Game description from the publisher:
Disgruntled with their greedy mean king, who has hoarded all of the treasures in his castle, the knights join forces. Already they have a plan for how to get the treasures back. They climb up the castle wall, one on top of the other, then leap into the castle. To do so they need your help.
In Klettermax Castle, each player stacks a tower made up of five knights of different colors and then carefully flicks the knight on top into the castle. Whoever is lucky at throwing the dice, is a nifty stacker, and has good flicking skills will win back the most valuable treasures.