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The secret ending is an alternative ending of the game located in Level 4 - Blackout that can be found only in the Steam version.

Guide

Turn the IDEA power generator on and head back down the hallway you came from. You'll see that the doors will open and a large white pawn will peek at you accompanied by a slide whistle sound effect. Approaching the pawn will cause it to move. If you continue backwards through the level, (the pawn sometimes peeking around various corners) you will see the pawn jump into the pit. Jumping in after the pawn, you will end in a huge room with a pawn in a brown paper bag with a pitched down version of Dr. Glenn Pierce's broken message from the end of Level 5. Head through the door and you will soon see a radio. If you click it the Standard Orientation Protocol will say:

Door opening.

If you continue down the hallway instead of going through the door, the hallway becomes a loop and you end up back where you just were. If you turn right instead you will end up in a room with a white pawn sitting at a desk wearing headphones and pulling levers. Above the pawn is several screens showing screenshots from early versions of Superliminal. Entering the room the pawn will turn around and look at you, and getting near the pawn allows you to hear the music the pawn is listening to. This is the same music that later plays in Jungles' Bistro. Shortly after the pawn looks at you, the screen will then turn black and a unique version of the credits will play with pictures of dog photos next to the scrolling text. This is a reference to the dog ending in Silent Hill 2.