STP writes: "There are five different tunnel themes--each with a beautiful new texture and awesome techno track--but unlocking new ones is tough. The game runs you through progressively tougher challenges; getting to the second level didn't take us long, but opening up the third and fourth were a bear.
But at $2.99, Swirl is a pretty killer deal. It's a unique sensation to spin your phone around like a pinwheel, but Swirl makes it fun. We'll be coming back to this one for a while".