Black and White Mahjong

A Mahjong game with a twist: match black and white stones.

Combine 2 of the same mahjong stones (one black, one white) to remove them from the playing field. You only can use free stones. A free stone is not covered by another stone and at least 1 side (left or right) is open. You can combine any flower tile with another, the same applies to the season tiles.