Click on the characters in the game for them to do something. Press "space" for them to change. Not all characters change when "space" is pressed. Click the pipe to change scenery. Click it again to change back. And there may or may not be a secret if you press certain keys...
Credit to the Mario Wiki for the Trampoline, Bowser Jr., Mario Kart, Bowser, Yoshi, Toad, Mario, Luigi, and Goomba sprites from the game Super Mario Maker.
