Here’s a fun and playful desktop gadget that will help you kill a few minutes.

The Bandai Space Warp Desktop was originally was released in 1983 and sold one million units over four years. The goal is to build your own mini roller coaster using the base, shafts and rails included in the set. As you can see from the photo above, the small iron balls glows in green in the dark.

Here’s a video demonstration showing the toy in action:

The Space Warp Desktop measures 308 x 232 x 105 mm and requires three AA batteries. The toy is available for $53 at HimeyaShop.com.

You can also get it from Amazon.co.jp for ￥3,780 (about $34 USD).