Patented by Erno Rubik, 1983.
(plastic, 2.5 inches diameter by 1.5 inches high;
yellow opposite green, blue opposite orange, grey opposite red;
also made in
and with six distinct pairings of the six colors;
like a cheese,
with directions on the package
A predecessor to the
where the two layers cannot rotate with respect to each other.
Similar to a
with fewer sections and without the center portion (but with the ability to flip along any of the three lines).
Although this is not a trivial puzzle
it is not hard to solve by just playing with it.
It can be solved to different color combinations
(e.g., left below)
and different patterns
(e.g., the two on the right below).
presents a solution.
from: www.uspto.gov - patent no. 4,410,179