: You need a digital copy of the game (an ISO or .bin/.cue file). To stay legal, you should rip this from your own physical copy of Tekken 3.

You need a digital copy of the game. If you own the original PS1 disc, you can rip it using a CD/DVD drive and software like ImgBurn to create a .bin and .cue file. Otherwise, searching for “Tekken 3 PlayStation ROM” will yield results. Look for the “NTSC-U” (North America) or “PAL” (Europe) version. Ensure it’s a clean, unmodified rip.