What's a meta-game in Halo 3?

[Darien LOVES? The Horrors]

On cheatcodecentral it says to get past the meta-game levels to get some armor.
How do you get points and do you need xboc live to do that?
xbox i meant to say**

 

[Lance Passenger]

its when you play a campaign level and you score points for kills and such to beat each level you have to get a certain # of points.

you turn it on where you turn on skulls

 

[Lance Passenger]

its when you play a campaign level and you score points for kills and such to beat each level you have to get a certain # of points.

you turn it on where you turn on skulls