Elan Lee failed out of several colleges before becoming a legendary video game developer. Matthew Inman started drawing cartoons online and now has over 1.5 million followers on social media. Here’s how two guys from digital backgrounds created one of the most successful table card games, Exploding Kittens. Sales top $80 million, and they didn’t have to spend a penny of their own money to make it. Just don’t point out the typo.