This Mexican Train Dominoes game will run on any iPad, iPhone, or iPod touch. One human player plays against 3 computer opponents of varying skill levels. The "best" train can be calculated by the game so you can improve your play. Many rule variations and options are available. Change the names of computer players. Change the speed of the game. Show numbers on the dominoes instead of pips. Just touch the "Menu" button and then "Help" to learn about all the options. Very addicting!