Open the game. Go to the "Data Select" screen. You should now see save files with all emeralds, all stages completed, and Level Select active.
High-completion save files are typically shared by the community on speedrunning and fan sites. 101 save file sonic 3 air
is typically found in the app's local data folder, though general Steam-based Sonic saves are often located in Location (Standard PC) settings.json Game configurations %AppData%\Sonic3AIR savedata.bin Progress and achievements %AppData%\Sonic3AIR needed to reach this completion level? Sonic 3 AIR | All Achievements | Glitchless in 1:24:57 [WR] Open the game
If you are looking for the secret "Paper Pantry" (a hidden room filled with paper assets), you can access it via the Level Select or Debug Mode rather than a specific save file. all stages completed
