Tantrix brain teaser puzzle is a color matching puzzle. Arrange the tiles so that all the colored lines match where the tiles touch each other. Additionally, for each puzzle challenge, select one color, and create a closed loop. Begin the easy puzzle by using the first four tiles (which are numbered on the reverse side 1, 2, 3 & 4). Increase the level of difficulty by adding the fifth tile, then 6th tile etc. Tantrix is most challenging when using all 10 tiles. Create even more difficult puzzle challenges by adding a second set of 10 tiles. When combining two sets tiles no 1 on set 2 becomes tile 11; tiles number 2 on the second set becomes tile 12 etc.