| Name | Description |
|---|---|
| GameModel | The GameModel is responsible for updating the logic of the game repeatedly. |
| Planet | A planet is a world object which is nearly undestroyable. There are two types of planets: those that are being influenced by other planets' gravitational force and those that are not. |
| Player | Defines an abstract player in the game. |
| Projectile | A projectile is a world object which belongs to a weapon and a shooter. Its attack value and its velocity depend on the respective weapon. |
| SimplePhysicsAlgorithm | Defines a concrete physics algorithm. It provides methods to update the world objects' positions depending on a simple physics algorithm, which only contains gravity and the difficulty level. |
| WorldObject | Defines an object in the world. |