Countdown d24 makes keeping track of your score or health points a delight. Based on a shape called the sphericon, it advances along a zigzag path with a gentle push. In the video below gravity provides the push to keep the die moving. Measuring 1-2/3 inches (42 mm) in the long direction, the Countdown d24 is available in black, white, and translucent amber

Price £8.87 p = 154