Patented by REFO Verlag GmbH 2002.
(plastic, 2.6 inches)
Turn the 6 rings so at each of the 12 places they meet the colors match.
This is a slightly simpler and more colorful version of the
Turn 12 puzzle
that as 24 numbers on each ring (each in the range 3 to 9, where matching is by adjacent numbers summing to 12
- see Jaap's Page).
Here are the directions that came with the puzzle:
REFO DE Patent,
from: www.epo.org - patent no. DE20112728