Simplify the following text for a Grade 8 native English-speaking person.
Original: Sierra Entertainment made a game version of The Mummy : Tomb of the Dragon Emperor for Wii , PlayStation 2 , and Nintendo DS , which was released on July 22 , 2008 in North America to mostly negative reviews . Gameloft made game version of The Mummy : Tomb of the Dragon Emperor for mobile phones .
Simplified: The Mummy : Tomb of the Dragon Emperor is a 2008 American adventure movie .