Tomb Raider: The Last Revelation

In the fourth installment in the series, you start as a surprisingly well-developed adolescent Lara Croft and her mentor on a quest to find the Iris. It follows the same scheme as the other Tomb Raider games: low polygons, engaging puzzles and crouch-in-corners-to-warp glitches that can be used to go out-of-bounds.

Unused level
ez1gfFIS5qI The Valley Temple, known by the file name  is an area that is completely unused.

Unused palace
Ivp6Voe8SeA There is a short palace of sorts on Khufu's Queens Pyramids. There is no way to access it normally, but it's just one jump away from being reached. It's empty on the inside, and the walls' texture is the picture of a woman.

Developer Message
Hidden within the game's executable file is a message from programmer Richard Flower at.

Tomb Raider IV - The Last Relevation -- Dedicated to my fiance Jay for putting up with this game taking over our lifes,my step sons Craig,Jamie & Aiden (Show this to your mates at school, they'll believe you now!!),also for my daughters Sophie and Jody - See you in another hex dump - Richard Flower 11/11/1999

Version differences
There are 4 versions. There's the first version, on the PSX only. Then there's the second one, also exclusive to the PSX that changes the following:
 * KV5
 * The first secret has been changed.
 * Adds a medipack.

The third version is the final one on the PSX, and the first one on the PC. It fixes the collision detections on the medipack's platform. It also adds a game over message.

The final version is PC exclusive, i.e. the 2nd PC version, and it adds rocks to the end of the driving section in KV5, to stop players from blazing through.

Unreachable medipack
In KV5, there's a medipack on a platform between two pillars. The first and second PSX versions have the collisions set up incorrectly on those pillars, making climbing them impossible. The first PSX version doesn't have this medipack, but the second version adds it; unfortunately, this version didn't fix the collisions, so, while it is there, it cannot be reached. YouTube video showing the medipack in question.