C64Commodore 64/8-bit · 1987 · Platformer
The Great Giana Sisters
The Great Giana Sisters (Commodore 64/8-bit, 1987) has an open-source reimplementation, bugix/OpenGGS, and 1 other public project.
Data checked 2026-10-12 · unbaked registry
Projects
ReimplementationC++23 starspushed 2023-08-16GPL-2.0 license
OpenGGS
Playable () PortMaster package: openggs.zip.
The Great Giana Sisters
RE candidate6502 disassembly (SourceGen/64tass) + VICE oracle; missingno7 c64_re…
No public decomp/disassembly found (as of 2026-10).
What you need
You need your own copy of the game: these projects ship code only.
More on Commodore 64/8-bit
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C64HabitatSource releaseSource port19855172026-10-09C64ParadroidSource releaseReimplementation+11985412026-10-06C64Alien 3Source release1992632019-05-19C64DeltaReimplementation1987512025-06-01C64Maniac MansionMatching decompDecomp+21987492025-12-11C64Nemesis the WarlockSource release1987412019-05-19C64GridrunnerDisassembly1982752023-05-19C64SláineSource release1987362019-05-19Found via osgameclones.com/, PortsMaster/PortMaster-New, en.wikipedia.org/wiki/The_Great_Giana_Sisters
GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.