PROTOTYPE is available for the Xbox 360 ( R ) video game and entertainment system from Microsoft and PLAYSTATION3 computer entertainment system for a suggested retail price of $ 59.99 , and for Games for Windows ( R ) for $ 49.99 , and is rated " M " ( Mature - Blood and Gore , Intense Violence and Strong Language - content that may be suitable for persons ages 17 and older ) by the ESRB .