Move with WASD or the arrow keys. On a touchscreen, drag to move and tap with a second finger to use your item.
Trapdoor!

The Door Run

Twenty doors in every row. Most let you through. Some drop you through the floor.

Clear all 25 levels. There is a checkpoint every 5 levels, and every new run has a different set of safe doors. Mystery boxes on the track hold power-ups, and some of them are traps.