Methylene Blue, methylthionine chloride or 3,7-bis(dimethylamino)phenothiazin-5-ium chloride is a chemical compound used as a dye and medication for Gram's stain, Wright stain[?], and the treatment of metoxyhemoglobinemia.
... and rewarding, and once the player has gotten through a level there are bonuses to collect, record times to beat, and a gold star for getting through the level ...