When you get to higher waves level, you should get new type of zombie instead of the same type with a bunch of them.
If you ever update this game, please fix the multiplayer and maybe add in ai as your team? Its lonely surviving at night.
4 boss or more? No problem! Plant mines like a barricade. Shoot rage injection to one of the boss and lure him to the others. Run back to your barricade and wait until they kill each other. Once there is only 1 boss left.... lure him to your barricade and watch as the explosion begins. If his still alive.... shoot him with your best weapon. +1 so everyone can see this ^ ^
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