HongKong is a new version of the popular Mah-jong patience game, Shanghai, from Steve Drain, written chiefly as “a demonstration of Basalt and its Toolbox keywords” (which is why it can be found on the ‘examples’ page of his website).
This version of the game differs from others in that it uses the drag and drop protocol to remove tiles – instead of, as is usually the case, clicking on one tile and then on another, matching tile, with HongKong you drag the first tile and release it over the matching tile. It also “differs in some other ways from alternative versions,” adds Steve, “so it might be worth a look if you are a fan.”