Project X

This one has four sub-games which combine a horizontal-scrolling shooter, a platformer (using a yoyo to climb!), a horizontal-scrolling run through a cemetery, and a crosshair shooter (of which borrows the moon and the target-system from Forbidden Forest). Written by the legendary Shaun Southern who wrote several classics on the C64, and co-desgined the famous Lotus series of racing games on the Amiga and Atari ST.