The rapid consolidation in the games development world continues and Bellevue, Washington-based Sierra On-Line Inc has acquired Papyrus Design Group Inc, developer of titles such as NASCAR Racing and Indy Car Racing. Financial terms of the completed transaction were not disclosed. Papyrus uis regarded as the worldwide leader in the motor racing simulation market, has a number of new titles in the works, including additional motorsport simulations. Papyrus employs 100 people in Watertown, Massachusetts.