Moving from one state to another is a mutation. In platform games, the ability to mutate gives access to new places. In some games, your character can take different forms and have access to places he could not reach in its original form. In the game Celsium, for example, you play a cube. In the form of ice, he can jump and is solid. It can mutate and turn into water. This allows it to pass through the platforms. It also has the ability to turn into gas and can fly in the air. The mutation is the key to success.