Gaming execs: Join 180 select leaders from King, Glu, Rovio, Unity, Facebook, and more to plan your path to global domination in 2015. GamesBeat Summit is invite-only -- apply here. Ticket prices increase on March 6 Pacific! Click here for all of GameBeat’s 2015 Game Developers Conference coverage. One of the most advanced game engines in the industry is now free, though you will still need to pay a royalty for its use after you ship your game.