Download the PPSSPP emulator from the Google Play Store or their website.
Because Tekken 3 was originally released on CDs with a capacity of roughly 650MB, the file size was manageable for its time. However, the rise of "highly compressed" files was driven by internet speeds of the mid-2000s and the limited storage capacity of early Memory Stick Duo cards. Gamers sought ways to shrink a 500MB+ game into a file often under 100MB or even 50MB. Tekken 3 Psp Iso Highly Compressed
This is the "highly compressed" format native to the PSP. It significantly reduces file size (often down to 20MB–50MB in extreme cases), though it may cause minor lag or stuttering in graphics-heavy scenes. EBOOT.PBP: Download the PPSSPP emulator from the Google Play