If you are looking for a portable PlayStation experience, the Go to product viewer dialog for this item.

There is no official because the game was never released for the PlayStation Portable . However, a thriving community of homebrew developers has created ways to play the game on legacy handhelds, particularly the PS Vita , which is the primary focus for fans looking for a portable PlayStation experience. The Reality of Hollow Knight on PSP

You cannot run the native Hollow Knight on a PSP. Anyone selling a "Hollow Knight PSP ISO" is either scamming you or distributing malware.

If you type that phrase into Google, you will be met with a confusing labyrinth of Reddit threads, dubious ROM sites, and forum ghost stories. Some claim they’ve played it on their modded PlayStation Portable; others insist it is a myth fabricated by clickbait artists.

An official Hollow Knight PSP ISO does not exist due to hardware limitations, with any such files being scams or malware. However, a dedicated community developed a functional, unofficial port for the PS Vita using a wrapper that requires original PC game files. For a demonstration of the unofficial Vita port, watch this YouTube video