One stage, Dreamscape, looks like it came straight out of LittleBigPlanet, complete with stage creation pop-up menus in the background, randomly selecting platform pieces for you and your opponents to overcome. Suddenly, out of nowhere, the screens in the back of the stage become a backdrop for a Buzz! quiz show, with Buzz coming out to ask random trivia questions. In one fight we were asked, "Which Sony handheld was released in 2011." The text from the four multiple choice answers fly over each fighter, and it seems you're supposed to attack the correct answer. It's strange, but it works, and makes for some really wacky fights.
The other three stages we saw were just as fun. The Hades stage starts out looking just like God of War, but the background transitions to feature scenes and characters from Patapon, cute cheering and song included.
Another stage called Metropolis is straight out of Ratchet and Clank at first, with its moving platforms and conveyer belts, but then rain starts to pour, and a huge hydra pops up from the back to attack fighters.
My favorite stage mixes a Jak and Daxter village with Hot Shots Golf. From nowhere, with no notice, Hot Shots characters begin using the play field as a driving range, with ultra-hot golf balls raining down on you and your opponents like missiles.