Welcome to Mario Maker Full 1.6 ! Click Create to get making! Click to stamp the selected block. Arrow keys to control Mario's position. Space to change selected block. Q to change block types. A to change the area (Overworld, Underground, Castle) Hold E to select the eraser, and click things to delete them. Hold R to reset the entire level. Hold W to move the Finish Pole. S to toggle between Edit Mode and Play Mode. While in Play Mode, use the Arrow Keys to move and jump.
I added Course World, but for now you can only play examples. If anyone knows how to use cloud data for saving a course, let me know.