From the Publisher:

Welcome to Roller Coaster Rush, a coaster-building game with oodles of kinetic fun!

Each game, you and your friends get to create your very own working plastic roller coasters.  Start by bidding on the best coaster parts, then flip on your engineer cap and use physics to build the best coaster you can!

The more twists and drops your marble makes it through without stalling, the more points you score.  Bid cleverly and harness gravity to create the awesomest roller coaster and win!