Marble Blast Gold is a 3D adventure game. It was pre-installed on some Apple Inc. computers like the iMac and iBook. It is also available for Windows operating systems as well as various Linux distributions. The basic gameplay involves rolling a marble from the start pad to the end pad, while avoiding the hazards along the way. On some levels, there is a Qualify time that the player must meet in order to move on to the next level. Each level also has a gold time which requires tricks to defeat. Most levels also require collecting a set number of gems along the way. There are 100 levels in all, divided by difficulty: 24 beginner, 24 intermediate, and 52 advanced. If you beat all 100 levels, there you can create your own levels. Source: Wikipedia, "Marble Blast", available under the CC-BY-SA License.