currently on level 107 and I have not lost a guy since level 5 or something. it seems like this could go on forever.
I got bored at level 300.
The mobs just get faster. You use enough freeze and poison towers and I don't know if it is possible to lose.
It does seem to just go on without much change in difficulty. And is it just me, or does the extra money upgrade seem almost useless? It gave me a bit extra in the beginning, but now around 150 or so, I don't get any extra money.
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