physical release. Western fans often use English patches to play it on modern handhelds. Where to Play Official Versions Now
Though the PSP missed the Titan craze, the subsequent games on handheld platforms (like the Vita) successfully translated the series' complex mechanics into portable form: Games like Wings of Freedom attack on titan psp game
If you are specifically searching for a "PSP game," you are likely encountering or highly compressed homebrew titles. These are independent creations that attempt to bring the Titan-slaying experience to the legacy hardware. physical release