In the original Mortal Kombat (1992) video game, there's a mysterious and elusive hidden stage commonly known as the "Reptile's Lair" or "The Pit Bottom" which you can access using specific requirements. This stage is the only "secret" stage in the game. Here's how you can access this stage: 1. It can only be accessed from "The Pit" stage, and only during single-player mode. 2. Look for a silhouette passing over the moon in the background. This event is random, and it might not happen every time you play. 3. If the silhouette appears, you must win that round with a double flawless victory (meaning you can't take any damage) and finish your opponent with a Fatality, no Block button can be pressed either. If accomplished correctly, you will be transported to the hidden stage to fight Reptile. Reptile is notably tougher than most characters because he has the speed of Scorpion and the powers of both Sub-Zero and Scorpion, making him a tough opponent to beat. It's worth noting that the original Mortal Kombat didn't really have a 'stage' per se as later games would, the fight takes place at the bottom of The Pit. While very hard to accomplish, especially under the pressure of the single-player mode, it's a neat easter egg that further added to Mortal Kombat's universal appeal. I hope this helps you, or anyone else looking for how to unlock secret stages in Mortal Kombat (1992)! Happy gaming!