I think that there should be more ways to get cash. Guns cost 50+ cash sometimes, and each cash is hours in a room, getting 250 kills, just for one. For the cooperative mode, you should make it so that the farther you get in it, the bigger the rewards get, and you can choose whether you want cash, xp or cash, like either 250 coins, 250 xp or 25 cash for beating a really hard cooperative mode.
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