If you want to build a jungle treehouse, tame an ocelot, and relive the spring of 2012, fire up Eaglercraft 1.2.1 today.

This version, often called the "Jungle Update," sits in a sweet spot for retro players. It introduced Jungles, Ocelots, Iron Golems, and improved world height. It has the charm of old Minecraft (no Hunger system worries? Wait, hunger existed, but the combat was simple) without the overwhelming complexity of modern versions (1.19+).