FYI, the saucer laser attack is NOT impossible to avoid. Just get under him when he starts charging it, then keep in the middle away from the beams. If you get positioning just right, you can shoot him while you do this.
During the wave where green portals appear and glowing zombies come out, I killed a certain amount then they stopped spawning. What the heck is up with that?
For people who haven't made it, there are 60 waves. I won't give spoilers as to the final boss fight, but here's a hint: you'll need on heck of a good weapon, probably AK-101 at least.
 "Pico Blast"){kind=icon}
 "Endless Zombie Rampage 2"){kind=icon}
 "Bunny Invasion: Easter Special"){kind=icon}