Nominated as a IGF Seamus McNally Finalist, NightSky is an ambient action-puzzle game that offers a gameplay experience unlike any other, as cerebral challenges fill uniquely designed picturesque worlds. The player must maneuver a sphere by using realistic physics to advance; each of these worlds is broken into different areas. The original soundtrack by experimental jazz musician Chris Schlarb will further heighten the surreal experience. IndieGames.com says: "NightSky does things with balls that you never thought possible, and is stunning in motion."
this game (or at least the "alternative" mode. i haven't tried normal yet) uses a combination of mind-bending puzzles and, to a greater extent, pixel-perfect execution requirements to provide hours of addictive gameplay while using a calming ambience to stave off frustrated ragequits. XD