(Known as Hydroventure Spin Cycle in the UK/EU) Fluidity Spin Cycle lets players tilt, turn and even rotate their Nintendo 3DS system 360 degrees to maneuver a puddle of water named Eddy through a maze-like, magical world.Easy to learn and difficult to master, Fluidity Spin Cycle may be an eShop exclusive, but it looks and plays like a full-fledged retail release. If you have even the slightest interest in physics-based puzzle games, add this one to your download list ASAP. Admittedly, there’s little here to quicken the pulse, and some of later objectives are troublingly fiddly, with sensitive motion controls and increasingly intricate level design proving uncomfortable bedfellows. But otherwise this is an unusually clever, polished and robust eShop release that offers several hours’ worth of dizzy delights.