Hi Shapeways fans, Keep Vertical is a ball maze that is supposed to be solved without using dexterity. The maze is kept vertical and rotate in steps of 90 degrees clockwise or counter/anti clockwise. The ball falls all the way through up to a wall where it gets stopped. This rotation and falling process is to be repeated until the ball ends up in the center. Watch the YouTube video. Download the CAD file to print-it-yourself. Buy the puzzle at my Shapeways Shop. Read more at the Non-Twisty Puzzles Forum. Check out the photos below. Enjoy! Oskar