Rocket Man is written entirely in machine code and uses a custom display driver routine to achieve pseudo high resolution graphics on a standard 16K ZX81. It features smooth animation, with each sprite consisting of multiple frames that shift by just 2 pixels at a time, and contains 6 different levels. Each has a different platform layout, and for levels 4 to 6 the rocket pack and fuel cans are replaced with a vulture and legs of lamb. There are three alternate graphic sprites used for the Bubloid, each with its own acceleration speed, and these are cycled through as the player progresses up the levels.
Read more about is on Paul Farrow’s website.
