To clarify, Sleeping Dogs was never officially released for the PSP. Any "PPSSPP" versions you see are typically fan-made mods—often using assets from games like Grand Theft Auto: Liberty City Stories
If you are looking for the Sleeping Dogs experience on other platforms, the game is highly regarded for several key features: Open-World Hong Kong sleeping dogs ppsspp
Any file claiming to be a direct "Sleeping Dogs ISO" for PPSSPP is likely a or a different game with modified textures. Modded Versions To clarify, Sleeping Dogs was never officially released