PPSSPP is an open-source PSP emulator for multiple platforms, including Android. Emulators themselves are legal in many jurisdictions; they provide a way to run software from other platforms. However, legality depends on how you obtain and use game files (ROMs/ISOs). Using PPSSPP with a legally obtained PSP game image you created from media you own is commonly accepted as a fair-use/backup practice in some places, but laws differ by country.
So, what are people downloading when they search for "Sonic Mania PPSSPP"? Sonic Mania Ppsspp Download Android
Sonic Mania was built using the Retro Engine (specifically RSDKv5) by Christian Whitehead and PagodaWest Games. It was released for PC, PlayStation 4, Xbox One, and Nintendo Switch. Because the PSP hardware was discontinued long before Sonic Mania was conceived, the game was never ported to the system. PPSSPP is an open-source PSP emulator for multiple
If you experience lag, go to the PPSSPP graphics settings and set: Backend: OpenGL or Vulkan. Using PPSSPP with a legally obtained PSP game