Quantum Castle

Gordy — a small, green, goblin-like furry creature — slips into the castle of the title in pursuit of the dragon's vast treasure hoard. But the path to those riches does not run through swords and monsters: each room is filled with arithmetic challenges aimed at preschool-age players. The dragon and the treasure wait at the end of the journey, and a closing cutscene confirms what the opening splash screen left ambiguous — Gordy is indeed the character the player has been guiding all along.