WARNING: If you read on, you are doing so at your own risk. The Instalment is a hidded construction and was built to secretly trap and kill those who know too much. You now know too much...
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Introduction:

Have you been looking for hours for a good puzzle map? Have you found nothing but either easy, over-complicated or literally impossible mazes? Well, look no further, because The Instalation is the best puzzle map out there!
The Instalment is a maze/puzzle/enigma or whatever map on Sandbox. You start in a room, with no apparent escape. You have to get out within 30 seconds, or you'll find a surprise.
The gametype is VIP, Escort. You have to reach the destination within 4 minutes, or else the round will end. There are 10 rounds, and whenever the VIP dies, the round ends. Playing with normal Escort won't work, so if you're too lazy to download the gametype,here are the VIP traits:
Limited Ammo
No Radar(sounds pointless, but is actually needed)
Starting weapons - Magnum and Plasma Pistol
No grenades at start.
Weapon pick-up: enabled
Normal health
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Setting Up for Co-op:

The map is designed for one person really, but this maze is the type that is fun to do with friends. Problem is though, with co-op come honor rules and stuff. Also, the game is designed for MAXIMUM 2 players. If played in 3, or more, the game wouldn't work. Even in co-op, you'll find out that only the VIP can actually reach the destination (there is a way to make it in 2, but it is unnecessary and VERY HARD).
Honor rules:
No double-jumping. This rule is clear. Double jumping out of the map is not allowed. Besides, it won't help you win.
Suicide when non-VIP dies. This isn't obligatory, but it may be a good idea.
That does it with honor rules, they aren't much, but respect them if you want to play a good game.
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Apart from that, remember NOT TO PLAY THIS IN FORGE! Not only it ruins the purpose, but only makes it less fun for you. The puzzle may be a little frustrating, or hard at times, but it will be worth it.
Also, if you comment on the puzzles about the solution, put a spoiler warning.

You start in an apparently sealed room with no escape. Wrong. Put the guns down, and start looking.

This is one of the many puzzles.

In co-op, jump one at a time.

Split decision.
If you are playing in co-op, split up. It will take away less lifes.

You spawn with a plasma pistol. You can use it as a torch.

Who says golf balls can't kill?

Split Decision.
Again, it's best to split up...or is it?

This pic just shows the VIP with a sniper. Only 4 bullets, make good use of them.

This picture shows the "jumps" section of the map. Be cautious, and look before you leap.

This is what I call the "Leap of Faith". If you stay on one end too long, it will tilt. Too much weight will also do it. This might be harder in co-op, seen as you want both to go across without the beam falling.
NOTE: When you reach the extremity, it will fall. In co-op, find a way to prevent that.

After a vehicular run, you arrive to destination. See the mancannon in the background? Be careful, since it's not guaranteed that you will make it.

You wake up. A timer goes off. You have only 4 minutes to escape. Your objective: get out. Alive. Only the best Halo 3 players are meant to reach the destination and survive. Are you one of them?

Download Map: Bungie.net : Halo 3 File Details
Download Gametype: Bungie.net : Halo 3 File Details

NOTE: The map has been edited! If you downloaded it within the first few hours download it again for better gameplay.