Some distribution versions come as a "Full ISO" (including all movies and endings) or a "Mini ISO" (no movies, often with everything already unlocked).
is technically a PlayStation 1 (PS1) game, it can be played on PPSSPP by using converted EBOOT.PBP files or by running it within the arcade version included in Tekken 5: Dark Resurrection Tekken 3 Iso File For Ppsspp
With save states on PPSSPP, you can save right before the final boss to quickly retry unlocking conditions. Some distribution versions come as a "Full ISO"