Features listed by the developer:

• Two great games in one:
  • Career Mode – Play 40 different action-packed rollercoaster tracks in a Wild West theme park
  • Challenge Race Mode – Replay all 40 rollercoaster tracks to out race the game designerÂ’s time!
• Expertly crafted tracks with realistic coaster physics
• Stunning and detailed 3D graphics
• Perform insane stunts to get a higher score!
• Unique iPhone and iPod touch controls — users can use the accelerometer feature by tilting the device to make the carts go faster and slower.
• Bright and stunning 3D art graphics

• Mass Effect Galaxy now on App Store, completion gives reward in Mass Effect 2
  

Via Touch Arcade