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by csande17 476 days ago
Not necessarily -- a lot of external hobbyist work has gone into reverse-engineering Sonic Generations, which has an official PC port and is based on the same engine as Unleashed.

Funnily enough, one of the most famous Generations mods is a project that ports over a bunch of levels from Unleashed. IIRC they changes the graphics pipeline to look and work more like the Unleashed one, too.