In 08Jul2008 Circulate Prologue was released as a demonstration. It's now free. Circulate is the full version and it's now available for $5.99. The game looks very polished and you can also check the video thriller. It has 90 levels with different goals as states the game description. I may buy this later... Update: here's a PocketGamer Circulate review for mobile phones (Rate: 8).