Hong Kong

This variant of Mahjong Solitaire has the player matching tiles from a flat tower as opposed to a stacked pyramid. Tiles must be carefully removed so that the tower doesn't collapse. A topmost tile must be supported by at least one tile underneath. Tiles below the top are worth more points, but increase the risk of a collapse. Configurations allow the player to set a timer, and change the shape of the tower. In the Game Boy version there is a hidden ball and paddle mini-game called "Hong Kong Block".