Produced in 1995.
(nine 2" square plastic pieces, patterns on both sides)

Arrange 9 squares in a 3x3 array so that edges match. Each square has on both sides the same pattern of 4 tangled ropes that has two connections on each edge. Different sides of different squares have a different combination of the four colors (red, green, blue, and yellow). More confusing than Rubik's Tangle 3x3 because one has to decide how to flip the pieces.

Further reading:
Jaap's Page, from: http://www.jaapsch.net/puzzles/tangle.htm
McFarren's Page, from: http://www.geocities.com/abcmcfarren/math/r90/tangle.htm
Thurston Patent, from: www.uspto.gov - patent no. 487,798