Peppers Adventures in Time

One of the most underrated Sierra games, Peppers Adventures is educational game at its best. Help the inquisitive Pepper undo the damage caused by Dr. Freds time machine. Innovations abound, from the fun and logical educational puzzles based on actual historical facts, to "question mark" icon that help you discover asynchronous elements caused by Dr. Fred, and the ability to play as Peppers dog Lockjaw during some episodes (with appropriate action icons). Its also difficult enough for adult gamers to enjoy. Highly recommended.