By Tony Maglio Minecraft just blew away expectations at the box office, and if anyone in Hollywood is doing their job, the phones over at Roblox ought to be ringing off the hook with 3-1-0 numbers.

(Before the Minecraft gamers come for us, yes, your game is one giant sandbox for open exploration, while Roblox is a social world of mini games. The average Minecraft gamer is 24, a rep told The ...