This pioneering Berlin performance group (with three directors!) conducts radical experiments in Theater der Zeit, which they translate as "Reality Trend." They've converted freight trucks into mobile theaters with one clear wall and put audiences of 50 in the back to be driven around European and Asian cities by actual truck drivers who tell stories about their lives. This Seattle performance, called Best Before, is a video game with a giant screen upstage—each audience member gets a Nintendo game controller and an avatar. The "renegade game developers" onstage and the players in the audience build (and possibly destroy) a world together. (On the Boards, 100 W Roy St, 217-9888. 8 pm, $24. Through May 9.)