Seven is a short physics-based puzzler created by the developers of the popular adventure game Makibishi Comic, in which your quest is to restore balance to a strange planet by travelling to each of the seven stages and retrieving the stars found within.

Players can access the helpful hint feature by pressing the H key at any time, or restart a level by using the R key after an unsuccessful attempt at solving a puzzle. You are allowed to play the stages in any order you like, although one of the puzzles can only be solved with the use of a particular item from another level. (source)