Xtreme XD, West Covina

Xtreme XD purports that its digital-theater ride operates in six dimensions. Three of these belong to the visuals, which spring out at viewers through depth-creating glasses. The rest belong to the suite of effects that jostle and excite the riders, ranging from seats that can jolt with up to 3 g's of force to systems that create the illusion of wind and light. Riders take their pick of a number of featured rides, which can include a roller coaster that speeds through haunted mines, safaris beset by stampeding elephants, and recreations of the nearly yearlong trip to Mars in real time.