Just to help with any confusion for absolute beginners, at the start of the tutorial when you import the files into AsteroidWars.bmx, there is an error in the example...
should read...
Sorry to be picky, but this is for beginners, yes?
Include "SpaceObject.bmx" Include "Ship.bmx" Include "Shot.bmx" Include "Rock.bmx"
should read...
Include "TSpaceObject.bmx" Include "TShip.bmx" Include "TShot.bmx" Include "TRock.bmx"
Sorry to be picky, but this is for beginners, yes?