This can get really hard. 10 or more zombies per spawn are impossible. DO NOT TRY 99 ZOMBIES WITH 100 MILISECOND GENERATION, THIS WILL SURELY SET ON FLAMES ANY HARDWARE DEVICE AND WILL CRASH THE SIMULATOR ON THE COMPUTER. Trying 99 on 500 milliseconds is fine, but impossible to survive for long. (P.S. the generation changes by -10 for every zombie you slay.)
I did 99 and 1ms, it’s just 0.1 fps
It basically broke, tho. I was just exaggerating too. My computer did handle it, but because it can handle ray tracing. That image above was when I had in at 99 with 1 ms.