The MOO Factory

Welcome to Moo Factory, where "passive income" means "a barn full of cows silently judging you." Start with one honest black-and-white cow and a dream. Milk her. Sell the milk. Buy another cow. Repeat until you've accidentally built a dairy empire spanning seven cow tiers, a Highland Cow with more hair than sense, a Super Cow in an actual cape, a Robo Cow that moos in binary, and a Cosmic Cow that phased in from the Milk Nebula and no longer bothers with grass.