Two points of clarification, as there seems to be misinformation: The game runs at 60FPS on both screens simultaneously (1/2)

— 4 Corner Games (@4CornerGames) March 13, 2014

And secondly, Endless Special ALSO features a double jump. The only mode without a double jump is Classic. (2/2) #igtr

— 4 Corner Games (@4CornerGames) March 13, 2014