This game is best served with a side of multiplayer.
There are many guns to play with. Each level you complete gives you guns to collect. Collecting guns and keeping them at the end of the level... Lets you keep them in your stash permanently.
Unlocking stuff in the game brings up a mini game. The harder the lock, the harder the mini game. Booms too have this mini game. There really isn't much to this game. Just a lot of fun. It's a rent for most, because of the controversy surrounding it. It is a game not to be missed however.