Apart from the campaign Revelations has something called Raid Mode where you can solo or co-op through scenarios (usually variants of levels from the main story) where you are rewarded with harder levels and points/XP for unlocking new weapons, characters and items. It is very addictive and adds a ton of replayability to the games. Trying to get a Perfect on every level is not easy but it's great fun trying. The gyro aiming is very handy as well because without it it is very difficult to aim.
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