Muller Riddle Page - This site contains riddles of all kinds and levels. You can try to solve or to submit a riddle. This is a frequently updated site. www.muller.co.il/riddle
The Riddler - Edward Nygma's Puzzle Web Site - Interactive animated stories featuring Batman's greatest foes and graphic puzzles presented by Edward Nygma, Gotham's great genius. perso.wanadoo.fr/prospero.milan/nygma