Ravensburger Tropical Frogs - 35 Piece Puzzle Since 1891 we've been making the finest puzzles in Ravensburg, Germany! Experience the quality you can grow with  piece by piece! Ravensburger puzzle pieces are extra durable to withstand the demands of little hands. Promotes the development of fine motor skills, association, task completion and independent play. Every Ravensburger puzzle exceeds all national and international safety testing standards.