Hall of Infinite Doors

You open the rough wooden door only to find a surge of brown powder overpowering you! Coughing, you lean against a wall, covering your mouth with your hands. Beneath your feet is something that feels strangely like very fine sand... sawdust, probably. You can't open your eyes to check in cause some of the stuff gets in. You walk through aimlessly until suddenly, unexpectedly, you fall through a strange hole.