An overview of the U.S. poker room shutdowns. Learn why Pokerstars, Full Tilt Poker and two other U.S. poker rooms were shut down on April 15th, 2011. Horse poker and mixed game players have a new poker room to play at. Lock Poker accepts US players and offer 9 mixed poker games. We are offering 35% rakeback, a 200% bonus up to $1,200 and several other incentives.