I loved one flag in H3 Last Resort; many fun nights were had playing customs 2 v 2 on the same console. Fat Kid on that forged map in foundry would have to come a close second though ... I can remember frantically tossing grenades to the ground trying to get a needler on the next spawn before fatty got too close...
Halo 4 doesn't seem to have the same depth of custom games as H3; whether it's because of the nerfed forge or lower population I can't tell...
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Fat Kid was a godawful waste of lonely Saturday nights. Headhunter, now there was an awesome gametype from Reach. Invasion was a lot of fun too. Fiesta is also awesome, obviously, but Slayer is probably the best of the best. Favourite maps? Oh man... Valhalla, Sandtrap, Guardian, The Pit, Powerhouse, (default) Sandbox, The Cage, Haven, Solace, Ragnarok (obvz).