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Easter Eggs - Eeggs.com
On the map Valhalla go to the big silver wall on the right to the red base behind the big rock by the Brute Shot, on the following dates different stuff will appear there. On Halo 3 main menu, select campaign and then go into difficulty. Look at the picture next to the difficulties whilst you're on easy and you can see a marathon symbol on the campaign shield. Back in SR2 there is an Easter egg were you see the Easter bunny.