Those who study esotericism are sure that there are several portals on the planet leading to parallel worlds. You will find one of them in the game Ancient Caculate and you can even open it. The gate is locked with a stone lock with a numerical value. At the bottom is a set of number tiles. Move one tile onto another to get the same number as the castle. Once you get the right number, the door will disappear and a portal will open. This way you can open countless doors in Ancient Caculate.