Invalid Exposure - A player's exposed tiles indicate that the hand must be a concealed. hand on the card. c. Impossible to Win - A player's exposed tiles reveal that it is impossible for the player to. win.

The goal is to match open pairs of identical tiles and remove them from the board, exposing the tiles under them for play. The game is won when all pairs of tiles have been removed from the board, and lost if the remaining tiles contain no exposed pairs.