Look for the Lego Batman 2 PSP ISO file online.
Pro tip: Enable "Buffered Rendering" to fix missing shadows and HUD elements. Lego Batman 2 Ppsspp File Download
To download for the PPSSPP emulator, you need the ISO or CSO0;bb7;0;903; file originally released for the PlayStation Portable. 0;16; Look for the Lego Batman 2 PSP ISO file online
: You can often find community-archived collections like the PSP CSO Collection . you need the ISO or CSO0