* Rubik's Tangle 3x3 Double Sided *

* 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