Link: Mahjong Chem -- Free Game to Practice Chemistry Knowledge!
http://gyazo.com/33b7434ccc65ff041b35478b1979af3e.png
It has several modes (including classic Mahjong)
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Link: Mahjong Chem -- Free Game to Practice Chemistry Knowledge!
http://gyazo.com/33b7434ccc65ff041b35478b1979af3e.png
It has several modes (including classic Mahjong)
Also now available for the iPhone/iPad! ;-)
Link for iPhone/iPad:
Mahjong Chem for iPhone, iPod touch, and iPad on the iTunes App Store