There are over thirty levels that can be played cooperatively or competitively with others on the same computer. The insanely challenging control scheme offers thrust forwards and backwards plus rotation as you repeatedly crash into the cave walls and other objects. Your ship can utilize primary and secondary weapons and shields to dispose of the varied enemies; the handy aiming laser makes shooting easier. Bonus points are also awarded for rescuing civilians. If you can overcome the controls, Retrobooster offers a pleasing amount of content through the level design and variety.