Cuphead

Brothers Chad and Jared Moldenhauer mortgaged their houses to fund a game that looks like a 1930s Fleischer cartoon. Every frame of Cuphead is hand-drawn on paper, inked, and watercolored — the same process used for actual 1930s animation. The result is visually unlike anything in gaming history. It's also brutally difficult, which somehow made it more popular. Over 12 million copies sold, a Netflix animated series, and a DLC (The Delicious Last Course) that took 5 years to make and was worth every second of the wait.