This game goes by many names: popular computer versions have included Shanghai, Taipei, Kyodai and Moraff's. If the tiles are dealt at random there may be no way to remove all the tiles, but many computer versions are programmed to arrange every deal in such a way that a solution is possible. This game seems to have originated as a computer game, and exists in many versions, using various tile designs and layouts. A tile is available for removal when it is at the end of a row, and is not covered by any tile in the layer above it. The objective is to remove all the tiles from the layout, but they must be removed two at a time, in matching pairs.

The tiles of a row rest on the tiles of the row below - each row should be the same length as or shorter than the corresponding row in the layer below. The tiles are stacked in layers, each layer consisting of several horzontal rows of tiles. Mah Jong tiles are traditionally used, but any design on the face of the tiles is suitable, so long as the tiles come in matching sets of four.

This type of solitaire is played with a set of around 144 tiles.

Thomas warfield pretty good solitaire