Clicking these download links rarely yields a game file. Instead, you are often directed to survey walls, executable malware ( .exe or .apk files disguised as ISOs), or browser hijackers that compromise your computer or phone's security. Safe, Legitimate Ways to Play Hollow Knight Portably

While you cannot play the official game engine natively via a PSP ISO, the homebrew community has made incredible strides in recreating the Hollow Knight experience for older hardware. 1. The Hollow Knight PSP Homebrew Demake

This requires a PS Vita, not a PSP, and uses a .vpk or data wrapper format rather than a standard PSP .iso file. 3. Malware, Adware, and Phishing Risks