Left mouse click on the skill level button you wish to play, either Easy, Not So Easy or Tricky. Then left click on the Start Dealing button to start. The game then generates the cards and deals them from the left pile to the right. When a pair is displayed you should then click on the SNAP button to call "Snap". This is shown by a Red "Snap" logo on the right of the screen. Be quick, the game will also call snap which is shown by a yellow "Snap" logo on the left.A pair is two cards the same e.g. two "Aces", two "Kings", two "4's" etc. Clicking when there is no snap or after the game displays its snap, is penalised. Also you can draw with the game and no score is added. If you are quick and call snap before the game then the number of the cards dealt so far are added to your score. You overall score is displayed at the bottom of the screen. This is your score less the computer's, for however many games you decide to play in one sitting. It is this score which is used in the High Score Table. You can access the high score table at anytime by clicking on it's button. If you have a high score when you click on this button, you will be asked for your name for the table, and it will be added. Trying more difficult skill levels scores more points.