STEP 1
Go to https://sonic3air.org/
STEP 2
Install and setup Sonic 3 AIR
STEP 3 (OPTIONAL)
Mod Sonic 3 AIR to your taste
STEP 4
Set your launch properties to boot Sonic 3 AIR when launching Sonic Origins
STEP 5
Congratulations now you can play the definitive version of sonic 3
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=2825091840
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