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They could make lots and lots of DLCs like more missions and bring the tention of the game very high and make it much more exiting and the thing i really like about halo 3 odst is that its a sandbox game just like grand theif auto 4 and other games like that and think it would be even better to have DLC for it.
There'll be an ending. It's not *really* sandbox like Fallout or GTA.
Even if it ends, they could release separate missions that could be played from campaign
Two makes there more than speakers.
ODST isn't a RPG.