Press the buttons on the left to change how many tiles you're putting down. Press the 'done' button to submit that number. Then the green and blue guys will go. Make sure to place tiles or you'll not be able to win, unless you don't have any tiles. Green and blue guys will also have to place tiles or they won't win, unless they have zero. There's 10 rounds so try to get first. Good Luck!
Based off a thing me and my friends did with a set of dominoes. I did modify a bit but got the basic rules in.