I've been experimenting with Survival Hard strategies recently (since Survival: Endless is not a frontier topic). Out of boredom, here's an extremely weird, asymmetrical strategy for Survival: Roof (Hard). O_o

It's only a test, and obviously a wave of Zombonis is a guaranteed loss. But this set-up can withstand a barrage of Catapult Zombies, Gargantuars, and Football Zombies.

What did you think? Do you have any suggestions? :)