You can change the size of the game for the desired difficulty.  For a more challenging game, you can increase the number of matches (pairs) in the game.  Tap the Matches? button to see the available game sizes.

The options are 4, 8, 12, or 18 pairs to be matched.  All of these look great on the iPad, but the cards for the 18 matches can be a little small on the iPhone.   For a quick game on either device, choose something small (4 or 8).  Often, several quick rounds can be as much or more fun as one large game.  Try several to see which your family prefers…

The setting for the game size is automatically saved so that you do not need to set this between every round.  The setting is also remembered if you close the game and reopen it later.

Next:  Settings