Real Mah Jongg is a social game that originated in China thousands of
years ago. Four players, named after the four winds, take tiles from a
wall in turn. The best tiles are made of ivory and wood; they click
pleasantly when you knock them together. Computer Solitaire Mah Jongg
(xmahjongg being one of the sillier examples) is nothing like that but
it's fun, or it must be, since there are like 300 shareware versions
available for Windows. This is for X11 and it's free.