Facebook has pulled Scrabulous from its US and Canadian sites, following legal action from Hasbro. The social networking site took the action in response to a lawsuit filed against Scrabulous creators Rajat Agarwalla and Jayant Agarwalla.

In the suit Hasbro claims the game is “a clear and blatant” infringement on its copyright and demands it be removed from the site. The suit also seeks unspecified damages.

Scrabulous has been enormously successful since launch, and now features around 500,000 users.