Ok there is a lot to explain here including as I said before it would be:
Space Camp - Watch your Back
Killtacular - Le' Shotgun
Sniper Spot. - Longrange

Things have changes and it is now:

Space Camp - WYB Hardcore (Watch your Back Hardcore)
Killtacular - Le' Shotgun
Boxphobia - Weakest.

Space Camp (WYB Hardcore) - You are in a boxed room with the Heaviest Gravity in the Universe, There are 4 boxes with crates in them up above. The Zombie will come bursting out any second.

Broken Down Rules.

Zombie respawns in a Box with a crate in it.
Zombie could respawn in any of the 4
Zombie whacks the Crate out with a Grav Hammer
Zombie is one shot dead
Zombie has Poor Invisibility
Zombie can run super fast
Zombie has energy sword and Grav Hammmer
Humans are dead after one hit
Humans become zombies when Killed.
Humans have a Shotgun

No one can Jump High
There is a teleport on the ground floor
The Teleport takes you to the tower
The Teleport is a two way

Link to gametype:
Bungie.net : Community : Forum Topic Listing : Forum Reply Listing
Link to Map:
Bungie.net : Community : Forum Topic Listing : Forum Reply Listing

Killtacullar (Le' Shotgun) - You are in a small room, No shelter, Nothing but you and your shotgun and your enemies.

Broken Down Rules.

Everyone respawns in the box.
Everyone has 10 lives
Everyone has a shotgun
Everyone is instant Kill

Link to gametype:
http://www.bungie.net/forums/posts.aspx?h3fileid=52012837
Link to Map:
http://www.bungie.net/forums/posts.aspx?h3fileid=52214498

Boxphobia (Weakest) - Originally called Hammerphobia, Boxphobia is good for testing your quickness skills. There are a few boxes splitting up two rooms. Humans on one side, Zomibes on the other. The Boxes have crates in them who will survive?

Broken Down Rules.

Big room with open single boxes splitting them up
Each box has crate in it.
Humans respawn one side
Zombie respawns other side.

Humans instantly get killed
Humans have one life
Humans have Grav Hammers.
Humans Try to push the boxes back in when zombie tries to break through

Zombie is Invincible
Last Man Standing gets 10 points
Zombie has Grav Hammer
Zombie Can run fast

Link to gametype:
http://www.bungie.net/forums/posts.aspx?h3fileid=52214801
Link to Map:
http://www.bungie.net/forums/posts.aspx?h3fileid=52214494