The term DOMINO, FOR INSTANCE can be solved by the four-letter word TILE. Dominoes are a popular game and recreational activity that originated in China during the 12th century. The game consists of rectangular tiles with a line dividing its face into two square ends. Each end is marked with a number of spots or is blank. The object of the game is to match one half of a TILE with another TILE that has the same number of spots on its half.