Whilst we know the Playstation has been hacked as far as i know you can only play from that region, so if you want to play a japanese PSX game you may need to buy a Japanese Version Playstation Classic, heres the games included:

Features 20 Best Games:
Arc the Lad
Arc the Lad 2
Armored Core
Biohazard Director’s Cut (Resident Evil Director’s Cut)
Final Fantasy VII International
G Darius
Gradius Gaiden
Intelligent Qube
Jumping Flash
Megami Ibunroku Persona: Be Your True Mind (Revelations: Persona)
Metal Gear Solid
Mr. Driller
Parasite Eve
Ridge Racer Type 4
SaGa Frontier
Super Puzzle Fighter IIX
Tekken 3
Toshinden (Battle Arena Toshinden)
Wild Arms
XI [sái] (Devil Dice)


PlayStation Classic>