https://www.youtube.com/watch?v=uRB7iUCX4KQ

23 years later: The Hidden Secrets of Alien Resurrection on the PS1

Alien Resurrection on the Sony PlayStation PS1 has a secret cheat code that has never been discovered - until now. It enables you to play backup discs without any additional mod chip or soft mod. It doesn't even need a memory card. Let's take a closer look at what it does and how it works!