Talk:Upgrades/@comment-38.109.29.60-20180719204525/@comment-38.109.28.229-20180730065842

Shredded Newspapers (5M) (unlocked at 100 Rabbit Cages) - Same as Sippy Bottles.

Looking at how the various upgrades unlocked at a certain number of buildings, and how the upgrade photo didn't match the building upgraded, I'm pretty sure each of the building upgrades are unlocked the first time you reach a certain number of buildings out of any in the set that upgrade would affect.