It is really hard to explain. It simulates a rocket take-off and landing. The story is you are rocketing to mars. You leave earth, slingshot around the moon, land on Mars. It's not like Star Tours, in that you are really moving. It's a bunch of four passenger "rockets" spinning around a central point. It creates a lot of g-force. You can't even lift your hands. You don't leave the building, just spin around, but you can't see you're spinning. You're in your rocket with three other people, sitting side-by-side. Each person has a video screen in front of them. You are warned to look straight ahead and not close your eyes, or you will feel the spinning and loose the illusion. The screen shows the sky and clouds as you're taking off, and then the space station and moon and then mars. It's pretty intense. We rode it three times last week, but not in a row. I don't think I could do it more than once a time. Hope this helps.