Maneuver a sphere through 10 worlds filled with unique challenges and new surprises. NightSky is a two dimensional physics platform game for Windows produced by Nicalis. A Mac version will be released soon! It is great for all kinds of players as it does not contain any killing or violence scenes so anyone can play it without any problem. Overall, it is not so easy as one might think, you have to use crystal sphere and complete levels by using physics.