Chest Shields

The player would be presented with a number of chests in the centre of the room, as well as a key. The key would have attached to it a map, which would correspond to a chart of shield patterns on the far wall. The player would look up the correct shield pattern, and then use the key to open the chest marked with that shield. Inside would be another key and map, and the process would continue until the contestant opened the chest containing the crystal.