Press the Green Flag, sit back, and watch everything EXPLODE. Also watch 'Days to Stage Four' meter: Stage Four is a full zombie apocalypse. It calculates the days. Kudos to DarkLava for 'Radioactive' by Imagine Dragons. The red circle represents the hoard size. Use the 'Speed' slider to increase speed and lethality. Use up and down arrows for mutation rate.
This is a simulation of the zombie apocalypse. Ten zombies, 1000 humans. A bit inaccurate, but still a good simulation to show you how fast things can go down. Humans will resist, but how long can they hold off the zombie hoard? How long until the city descends into total zombie chaos? Or will the survivors scrape by, leaving only a handful of humans left in the whole city?