This is a very simple and easy trick to do. All you need are 2 units, one will be shooting and the other will be in godmode, so make sure you have your clicking finger ready because you will need to click a lot. The shooting unit should be one of the best you have, while the running unit should be very cheap, since he won't be using any weaponry. Place 1 unit on a spot, which will be your shooting unit, and then another unit, which will be the unkillable unit. Now all you do is run unkillable unit back and forth between spot. If he runs into or gets hit by zombies while running he will take no damage. Even better. if there's a large group of zombies in a small space, your unit might get stuck and he will stay there, getting hit but taking no damage.This is very easy to do, but just make sure that you pick good spots beforehand, as it can get a little heavy at times.

Onto the grenade glitch! Once you get grenades from supply crates or having someone spawn with grenades, simply pause the game and spam the grenades onto where you want them, unpause, and watch them fly and kill anything and everything. One thing though, I've done this with 30 grenades and it gets loud, so if you have alot of grenades, turn your volume down.

The last one, which is the supply crate glitch, is an easy glitch on how to get a supply crate each round. Normally you just wait right? This glitch does require you to wait, but not as long as usual. When you finish a wave, just wait until you hear "Supply crate available", then just go to the next wave and grab it and so on. This is just a spawning glitch, so if you need grenades each wave and there are no current crates when you finish the wave don't do anything until you hear it spawn and go grab it.

These are just 3 strange and random glitches that I've found while playing. I'll be sure to update if have any glitches, and if you have any glitches that I've missed, just message me and let me know! Thanks for reading!