Halo: Reach Challenge Initiative - Triple Thrill
Earn any 3 Sprees in a multiplayer Matchmaking game.
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You have a couple options for this. Living Dead can make this pretty easy as all you have to do is get 5 shotgun kills in one life and that's 3 Sprees right there. Another more unique option, if you aren't as good with Killing Sprees, is to go for Bro Slayer and get Spawn Sprees. You could also get a few Sprees in Grifball if you are fairly good at that.