Just got a small idea, perhaps there would be like statues, special buildings etc that zombies has to destroy, to gain a small bonus, such like 5-10 seconds of Time warp/Energy charge
I agree with the comments about the collectors, in a prestige, the first 50 levels i run thru them so fast, the collectors doesnt even collect 5%, dont know how fast the bones fade tho.
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why is pvp forced? you can just play the normal idle mode.