UPDATE 6/12/19: I've fixed an error in the X-Tile that was an oopsie in tinkercad.

Solving a cube fast requires developing a lot of hand eye coordination. After you've mastered that, why not work on your hand touch coordination? These tiles can be glued to the sides of a cube to make it suitable for solving without looking at it. This is a great mental workout for those who have already mastered a normal cube and an opportunity for those who are visually impaired to take on the challenge of solving a cube.

These tiles will likely fit a variety of different cubes, including Rubik's brand, but were designed specifically to make sure they fit on the Moyu Weilong GTS2. All 6 tiles are symmetrical, so that you don't have to worry about orientation.