The Dominos app for the iPhone is the classic game of Dominos with a few extra options. The game itself is very graphically appealing and is really enjoyable to just pick up and play if you like Dominos, but isn't necessarily for everyone.
The game does offer a one or two player setting in which you can either battle the computer or a friend. You have three options for the ruleset, including International, Points by 5's, and Draw Game. You can also change the skin and your username in the settings area as well.
In the game itself you simply select the domino you want to place. The most intensive action that you would actually make would involve you deciding which side you want to place the domino on if there are multiple it could connect with. Besides that, you simply tap the dominos if you don't have one that fits and you'll get the right ones.
Unless you're a huge fan of Dominos, you probably would want to pass on this app. The lack of instructions for someone who doesn't know anything about the different rule set will really turn off those who have no idea about how to play Dominos.