Somewhere in the Multiverse, in another Aperture not too different from ours, an intern working on the Conversion Gel project had a stroke of inspiration: if moon rock is such a great portal conductor, why not open a portal on the Moon and get it ourselves instead of buying it at exorbitant prices?

Twenty years later, the name of that intern is lost to history along with every other brave but stupid soul who tried opening such a portal without pressurizing the room first. But his legacy lives on in Aperture Laboratories Annex Luna-C, a vast network of Lunar mining facilities and chambers for low-gravity testing. What happened to A and B? Science happened. Now Aperture is completely focused on Luna-C.

If you're reading this, it means you have been selected for mandatory inclusion in the Aperture Science Volunteer Employee Gravity Liberation Testing Program. Congratulations! Feeling overweight? You won't on the Moon, where gravity is one-sixth of Earth's.

While a basic familiarity with (and survival of) Aperture Science test chambers is helpful, test subjects should be aware that moving and testing in Lunar gravity requires a very different approach. You will find that you can jump higher and farther, but building momentum--or shedding it--is more difficult.

The first few chambers can be thought of as a "tutorial" for test subjects to acquaint themselves with the fundamentals of low-gravity movement in a safe testing environment. Subsequent chambers will become progressively more complex.

To avoid risk of serious injury, please bear in mind the following important safety tips:

- If you experience nausea or disorientation, don't worry: this is normal. It is simply a sign that the laws of physics still apply on the Moon and that you are successfully acclimating to a low-gravity environment. Be advised that compliance with Aperture Science Employee Code of Conduct 319.112.24 requires that all test subjects be responsible for disposing of their own personal low-gravity acclimation syndrome expulsions. Remember: a clean test chamber is a safe test chamber!
- An object in motion stays in motion yadda yadda. In other words, think before you leap, particularly in the presence of hazards. Once you're in the air, you're committed until you hit something--the floor, a wall, deadly lasers, or the lunch you just lost. (See also: ASECC 319.112.24)
- Do not strike, damage, deface, abuse, lick, or insult outer windows, no matter how poor your view of the Lunar surface. All windows should be assumed to be sentient Aperture Science Personality Constructs unless they specifically indicate that they are not, and should be periodically praised for the scenic quality of their vistas.
- Doors are expensive; for your safety and testing convenience the Aperture Science Atmospheric Emancipation Egress--or "airlock" for short--is equipped with exactly one set of pressurized doors. Do not under any circumstances open the airlock doors while in the test chamber, unless opening the airlock doors while in the test chamber appears to be a deliberate part of the test.
- If opening the airlock doors appears to be a deliberate part of the test, be advised that opening the airlock doors will void their warranty, which specifically prohibits opening them except in case of emergency. For a definition of what constitutes an emergency, please contact your supervisor and request permission to receive the *bzzzzt*

Test chamber 05 has now been released!