Unlock Grunts Birthday party
In Arbiter level, go to end and fly down in the banshee. It is hard to see but Grunts are dancing around it
Unlock Angry Mode
In Convenant Holy City, reach first outdoor area with dirt and vegetables. Turn right, run to the wall past the gravity lift. Follow top of wall
Assasins mode
Find on Regret, after first lift ride, grenade jump from first awning to ledge in front of you
Unlock Blind mode
At outskirts, jump up the ruts in firs twall, then jump on roof and go to left. Should be next to camera
Unlock 2 New Guns
Beat game on easy, then hard in 3 hours
Unlock Foundation map
Complete game on any mode after taking Banshee in last level
Unlock Iron mode
On last Chief level, in Final lift, look up
Random message
Enter ".fortune" as profile name
Unlock Sputnik mode
AT start of Quarantine, go through tunnel, then carefully walk along ledge
Skip Halo 2 Final Brutes
Get a banshee in last level. Fly to the right of the building when the door is busted. Go towards bottom right and you should get the cutscene with Tartarus. You can then fight him.
Unlock Different Ending
Finish on Legendary
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