Eric Carroll's Dominoes

• This website contains a Java version of block dominoes. When the game opens, you pick one to three computer opponents to play with. Then the game sets up the pieces automatically and gives you helpful hints about which domino you should play. Plus, a set of explicit and easy to read instructions can be found right below the game board.
  
  http://www.void.org/~eric/domino.html
  
  

Dominoes Online

• In this no-frills domino game, you play against one computer opponent. The dominoes are placed automatically, and the scoring is calculated by the program. All you do is point and click. While there are no explicit directions, the Draw version of dominoes is easy: simply match corresponding numbers of dots and try to get the endmost pieces to equal a multiple of five. If you don't have any dominoes to play, draw from the pile. The game only has one level, which is quite easy, and it provides a helpful pop-up window to tell you when you're making a wrong move.
  
  http://www.checkers.ws/board_games/dominoes_game/dominoes_online.htm
  
  

Gamesville Dominoes

• This online dominoes game allows you to play against other domino players on the Internet. You can join Gamesville to win prizes and chat with your opponent or choose "Guest Play" for a no-frills session. By clicking "How to Play," you will be provided with explicit instructions on how to play a simple block game of dominoes. Once you feel comfortable with the rules, you are ready to play. The only downside of this site is that you may have to wait a few minutes for a suitable opponent to arrive.
  
  http://www.gamesville.lycos.com/games/dominoes?FOD=1&
  
  

Devworks Dominoes

• Devworks proves that just because a domino game is simple to use, it doesn't have to be boring. Devworks Dominoes offers traditional point and click online domino games with cool animations and music. If you need to brush up on the rules and scoring of the game, click "Instructions" for a brief but informative list of the rules. Then enter the game where you'll play against one (easy) computer opponent and receive hints on which dominoes you can play and where they will be placed.
  
  http://www.devworks.com.br/webgames/categoria.asp?pag=6&jogo=7&lingua=en
  
  

GuerraGames Dominoes

• GuerraGames Dominoes offers a black and white domino game for players who don't like their board cluttered with bells and whistles. The domino game rules are listed below the game board in three short sentences. And while there are no hints or tips, if a move is illegal, the game won't respond. This simple draw game is played against one computer opponent.
  
  http://www.guerragames.com/website/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=8&MMN_position=11:5