Ive noticed allot more mosters transfer from Map levels like Big Worms in level 2s, and so on. Also when it comes time for the map to end because the final moster was sleign only the person who killed it is put outside and the others stay inside with no monsters left. So they have to unstick. The maps are more often empty then they where before, and the maps often say. Cave Destroyed as you enter the map and kick you out again.
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I know not with what weapons WWIII will be fought, but WWIV will be fought with sticks and stones. -Albert Einstein