While projects like Sonic 3 Complete, try not only to preserve Sonic 3 but improve the original which is great, but there's just one problem in Sonic 3 Complete's Case it's a ROM Hack which means its Illegal to Play. The reason this is an issue is due to Game Preservation, in Sonic 3 & Knuckles case due to Michael Jacksons Music and Brad Buxer threatening lawsuits to SEGA it's puting a heavy weight on Sonic 3's preservation. If you've used an emulator and Downloaded a Rom of say Sonic 1, 2 or KiS2 you have pirated the game, piracy is Illegal. One thing that people often discuss is, piracy in gaming that is to say when games should be pirated and if there's a way to eliminate it altogether.