Now, after overseeing the game’s empire with his parents, Butler has sold the rights to the game to PlayMonster, whose other well-known products include Spirograph, Farkle, and Yeti in my Spaghetti. Terms of the deal were not announced, but Taco vs. Burrito (which retails for $20 on Amazon) has sold 1.5 million copies life to date. The game also has two expansion packs.

PlayMonster says it will continue to expand the game and a version in a collector’s tin is coming later this year.

Butler, who is now 15, says he’s not especially sad to see his creation move on. It was, he says, never really something he wanted to keep doing for the rest of his life.

“It was never something that I’ve been attached to or anything,” he told The Seattle Times. “It’s not super important to me. I just kind of wanted to get the most money out of it.”

Alex’s mother is an entrepreneur herself, so when her son came up with the idea after playing card games like Exploding Kittens, she encouraged him. The family would walk to the neighborhood coffee shop/hangout to test the prototype, which would lead to Alex coming up with a new take on the rules.

To cover production costs, he mother launched an online fundraiser, which brought in $25,000. Alex’s parents set up a holding company for the game (of which Alex was the majority owner), found a manufacturer, and put the game on Amazon. It quickly took off and never slowed down.

While there have been buyout offers in the past, the family said they never felt right. When they began speaking with PlayMonster, things did.

Don’t expect another game anytime soon from Alex, though. His interests have shifted to music production, sports, and video games, he says.