Homepageedwin guevaraPuzzles solved by edwin guevara Puzzles solved by edwin guevara 56Difficult puzzles.Grażynasolved 3,184 timesSolve puzzle6Hydreso.edwin guevarasolved 13 timesSolve puzzle6NON-METALLIC OXIDEEdwin Guevarasolved 2 timesSolve puzzle4Metallic oxideLa nomenclaturasolved 31 timesSolve puzzle