Oklahoma Boomers: Sooners is a mini-expansion for Oklahoma Boomers, that adds 3 Sooner meeples to the game. "Sooners entered the prairie before the official start of the Land Run. Even though that was not allowed. As penalty they must help the boomers by placing cornerstones. But beware! Sooners can suddenly change from a good help to a big threat!" The mini-expansion contains 3 grey Sooner meeples (and 6 stickers), that are placed on the board at the beginning of the game.