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No. You have to play on ranked, or social matchmaking.
Yes, you can mod campaign mod on the Halo trial.
Yes it does its called the campaign.
yes
Complete Campaign Mode On Legendary
Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
go through the story mode/campaign.
You have to find all the skulls in campaign mode.
To play campaign mode in Halo Custom Edition you need a custom AI file. Downloadable from http://hce.halomaps.org/index.cfm?pg=1&sid=26 . You need to download a custom AI file with Campaign mode and put it in the 'halo/maps' folder. Don't forget to backup the original AI file (just rename it).
you can if you play coop campaign mode. The second player will be the arbiter
Sandtrap.
I have,the key is to use cover and strong weapons