Remember back when i was too scared to put a credit card in to buy the new maps, All the fun trying to level up past level 20, The menu the matchmaking everything about Halo 2 was absolutely glorious, No youtube you had to find glitches by something tell you in a game or a friend messaging you. Oh and super jumping :D!
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Co-op campaign and the pain those darned jackal snipers bring. Super jumping, crazy! I only played Halo 2 online in the last few months, but I loved every bit of it.