Shisen-Seki is a game of Shisen-Sho – a classic japanese logic game utilizing Mahjong stones. Programming & fonts by Artur Rojek (zear) and graphics by Joe Vargas (jxv).

The goal of Shisen-Sho is to remove all stones from the board. Do so by matching pairs of stones with the same face.
You can only match stones if they can be joined by 3 or less lines. Each line must be either horizontal or vertical and can’t cross other stones on the board. Not all games are solvable.

http://boards.dingoonity.org/gcw-releases/shisen-seki-v0-2-0/