# How does zombie spawning in Die2Nite work?

What determines the number of zombies that will be in a zone in the world beyond?

Does killing a zombie while you are in the World Beyond mean that zone will have fewer zombies the next day as well? Does it basically go through and add a random number of zombies to each zone, and all the ones currently there remain?

Also, does killing a zombie in the World Beyond have any impact on the size of the nightly attack, either on that day or on subsequent days? Is there any correlation between the size of the nightly attack and the number of zombies in zones in the World Beyond? Sorry, that's a lot of questions, but I'm sure someone can answer them all.

• I've been wondering these things too. Commented Dec 2, 2010 at 16:49

Here's how it appears to work

1. Start by spawning zombies at buildings (day 1)
2. For every night, for every tile:
• For every neighboring tile with zombies, there's a chance of one more zombie spawning
• For every two zombies killed in this tile, there's a chance of another one dying by despair.
3. If the total number of zombies drops below 2 × map side × day number, spawn more zombies. (A 12×12 map has side 12.)

We're testing a spreadsheet (live link) that puts these rules in practice in Itching Plantation of Shadows. Time will tell.

• Credits to desolation for this info.
Commented Dec 2, 2010 at 12:23
• Wow, very interesting. So you could theoretically clear an area and it would take a while to fill back in. Do you know anything about the other half of the question, does this have any impact on the size of the nightly attack? Commented Dec 2, 2010 at 12:54
• 2 × map side × day number that means 24 * 666 = 32K. but bwarner states that the 666day event did not show sky rocketing zombies outside. so what excactly happens in step 3?
– Andy
Commented Dec 17, 2010 at 9:45
• @Andy Zombies would have skyrocketed as the game proceeded to day 667. It didn't, however.