I do not have the Ageia Physx card that the game recommends. I also have an older Pentium IV running XP that will not load the game. I am running it on Vista Home Basic 32 bit with 4 GB of memory. This is a good-but by no means top-of-the-line-graphics card. I do, however, have a new graphics card, which uses an Nvidia 8800 GeForce GT chip. Not a screaming powerhouse of a computer, by any measure.
I have a year-and-a-half old Dell with a Core2Duo 1.9 GHz. On the other hand, users with newer computers will enjoy dramatically improved graphics and physics modeling (see below). On one hand, users with older, slower machines, will not be able to play it. Other reviewers were right that this game demands a lot from system hardware. You are given a challenge (e.g., put this ball in that basket) and provided a set of elements (e.g., gears, belts, motors, explosives, ramps) to complete the task by building Rube Goldberg-or, for the modern generation, Wallace and Gromit-contraptions. Version 2.0 follows the same basic format as the earlier incarnations of Crazy Machines. I have collected some observations about the game that I hope will be helpful to prospective purchasers. My 7-year-old son and I are addicts already. The graphics and gameplay are a huge improvement over versions 1.0 and 1.5, which themselves were fantastic games. In a nutshell, this game is awesome-both for adults and kids.