(Click to Enlarge)
This week, I present to you the Rainbow Masterball (a.k.a. Geomaster), an invention of Hungarian Dr. Geza Gyovai.
The puzzle consists in 8 segments (each with a different color) and 4 layers and belongs to the family of Twisty Polyhedra. This particular Masterball is one of the easiest versions to solve, not like the picture ones where you have a much harder challenge.
Regarding its maneuvering, it's very pleasing to turn due to its "clicky mechanism" that tells you when the pieces are in place, which makes the whole experience with this puzzle much more satisfying.
Launched some 18 years ago, the puzzle has now dozens of color and picture versions. You can still buy some versions today (see links below), although much of them are now quite rare to find.
Puzzle Master (For sale)
Milan's Puzzles (For sale (scroll down))
Puzzle-Shop.de (For sale (click first link in right menu and scroll down to 'Ball Puzzles'))
Jaap's Puzzle Page (Solution)