If you want, simply hitting the flagpole won't be enough to finish a level. Most importantly, you can also set new 'clear conditions' for your stages.

Building a solid vertical wall will stop the screen from scrolling, letting you make hidden rooms and sub-levels. The custom scroll tool will let you make auto-scrolling levels, which can add extra challenges and should help make shump-likes feel more natural. If you're an advanced stage maker, you're also getting some new items that will help you create brand new kinds of levels. You get parachutes, on-off switches, the constantly moving 'snake block,' conveyor belts, rising and falling water levels, brand new power-ups like the Dry Bones shell, and much, much more. You get enemies like the Super Mario series' recurring mini-boss Boom Boom and the giant-sized Banzai Bill.