DUI asks you to guide a sprite to safety by rolling it back and forth with the arrow keys and destroying blocks with the mouse.

To advance to the next level, you must rest the sprite on a colored block and destroy any moving blocks on-screen, as well as fulfilling the removed block quota in the corner of the screen. Usually completing these goals go hand in hand, but keep them in mind.

To add difficulty to the mix, the sprite cannot come to a halt below the red line across the screen. If it does, the level restarts. You can get away with having a portion of it above the line or running the ball below the line-- in fact, some puzzles hinge on doing this.

There are thirty-six levels in all, plus a well-rounded level editor to create your own tricky puzzles.