: The port has recently reached V0.81 Hotfix (as of early 2025), which significantly improves performance over earlier builds.

The PSP cannot run the full original PC game perfectly. This version is a fan-made demake or proof-of-concept. For the best experience, play on PC, Nintendo Switch, or modern consoles.

remains technically unfeasible due to the console's hardware limitations, the Vita port has reached a highly polished state. Latest Version Highlights (v0.81 Hotfix)

The latest community update (Revision 0.81) focused on stability and performance parity with the modern console versions: Performance Gains

However, the "PSP ISO" you are looking for refers to a impressive created by the community. This port allows you to play a version of Hollow Knight on your PSP or PPSSPP emulator.

Hollow Knight PSP ISO – Updated Version (Unofficial Port)