-Animates a Rubik-like puzzle known as Cube 21 or Square-1.
-The rotations are chosen randomly. See also the "Rubik" and
-"GLSnake" screen savers.
+The "Cube 21" Rubik-like puzzle, also known as "Square-1".
+The rotations are chosen randomly. See also the "Rubik",
+"RubikBlocks" and "GLSnake" screen savers.