GRIFFFFFFBALLL!

If you've put down Halo 4, I highly suggest you pick it back up. Grifball, aka the "E" version of football, is back and it's awesome. Run around with a grav hammer and smash other players, while using your sword to slash the opponent ball carrier when necessary (or you can use a hammer as well, but be careful of launching the carrier towards your goal if he jumps)

Anyways, the game variant is so much fun. If you haven't tried it in Halo 3, and haven't played it yet in 4, go get started! It won't let you down!