Okay so, wave 40, with Mr. Whiskers my cat reloading my empty guns, with 6 level 2-3 shooters. When my grenade launcher isn't enough I just swap it with my cat (who reloads it nicely) for my M249 SAW. God bless America.
Side note: If Mr. Whiskers, the cat dies, I would have quit the game immediately, but we both made it when the army came for us, safe and sound.
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