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Rubik's Brain Racker (aka Rubik's Delta Ball)
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Looks like an Impossiball but is a moving hole puzzle which allows the pieces to change their orientation.

This is an highly unusual twistypuzzle. At first it resembles the impossiball: There are twenty triangular pieces on a sphere.
To start playing one has to twist the piece with the keyring and take it out. This leaves a hole which allows to play the puzzle like any with a moving hole. In every move one of the adjacent pieces has to be moved into the hole. While doing so it has to be rotated by 60° in any direction. These rotations make the puzzle special as orientations are unusual to puzzles with moving hole. Even more this puzzle knows no restrictions with respect to allowed positions and orientations.
There are five pieces for every of the four colors red, blue, yellow and green. The puzzle comes with instructions about many suggested goals which all show more or less beautiful patterns.



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