Browse to the PSP/GAME/ directory where you placed the file. Click on the Sonic Mania icon to boot the game. Optimizing PPSSPP Settings for Best Performance
Open the RSDK loader app (or map the PSP eboot in PPSSPP) and select the SonicMania folder. Alternative: Native Sonic Mania Plus for Android Sonic Mania Ppsspp Download Android
Even if someone hacked the game down to run on a PSP (a "demake"), it would look terrible. PSP resolution is 480x272. Sonic Mania is designed for 1080p and above. You would lose the crisp pixel art that makes the game beautiful. Browse to the PSP/GAME/ directory where you placed the file
Searching for "Sonic Mania PPSSPP ISO" puts your device at risk. Here is what those downloads actually contain: Alternative: Native Sonic Mania Plus for Android Even
Go to the Google Play Store and search for (by Henrik Rydgård). Install the free version—it’s fully functional. The Gold version is a donation.