In the Halo lexicon, Slayer is a term for deathmatch, a gameplay mode that deals with the accumulation of frags (kills).
The skull is considered to be a melee weapon and so it replaces whatever armament was previously equipped; if the player desires to use any other weapon, they must first drop the skull.
A listing of all current playlists, and the gametype variants they use, is available at Bungie.net.
Others were taken from the Halo2 Multiplayer Map Pack, an accessory disk that included extra maps and new behind-the-scenes features for Halo2.
Secrets: Halo 3 logo can be seen on the upper part of the pillers by the rocket luancher.possible to super-bounce to the arches over the map, also possible to climb there by parking a warthog under the airvent in room 3.