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I've been to thirty with the teleporters activated, but I didn't PaP anything, if that counts.

I have heard, that fundamentally past level 30+ an un-upgraded weapon is useless.

"But, In Verruckt you can't upgrade! I went to lvl. 56543!
Yes, But On Der riese the damage of the guns/ health of the zombies fall and rise drastically, and thus forcing you to upgrade.