HomepageRuben FonsecaPopular puzzles created by Ruben Fonseca Popular puzzles created by Ruben Fonseca 54QUALITY OBJECTIVESRuben Fonsecasolved 687 timesSolve puzzle108Quality objectivesRuben Fonsecasolved 683 timesSolve puzzle99Classification of organic compoundsRuben Fonsecasolved 25 timesSolve puzzle