This was really done as a test case for the py8dis tool for automatically disassembling 6502, but the result is a complete disassembly of the BBC Micro game Chuckie Egg (1983). The assembly is available in both beebasm and acme formats.
Or play the original game.
This is heavily based on RTW's disassembly of Chuckie Egg, see Stardot forums.