You can play a timed demo for free at Big Fish Games or GameFools .
While the "Full Version" is typically a paid product, you can find free trials or legal full-game downloads at the following sources:
To own the permanent full version without time limits, it is sold at WildTangent Games and Zylom . Game Features & Highlights
The game has been archived as "freeware" or for borrowing on the Internet Archive .