The opening bell has sounded, and Glu Mobile (NASDAQ: GLUU) is about to step into a World Wrestling Entertainment (NYSE: WWE) ring.The software developer announced that it struck a deal with the "sports entertainment" purveyor to create a wrestling game for mobile devices. Neither the terms nor the value of the arrangement was made public, although Glu Mobile did say it was a multi-year deal and that the game will be released worldwide next year.The company added that the title will feature some of WWE's top "Superstars" (the term the wrestling company uses for its in-ring talent), both active and retired.