If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this game you need to remove all the cards until only the aces are left. When the top cards of two columns have the same suit, you can click the lower ranked one to remove it. Aces are the highest ranked cards. When one of the columns become empty, you can click to move the top card from another column to its place. You can also click the deck of covered cards at the bottom to deal new cards.