This game advertises 18 card games, but has a 19th game - Strip Poker - as an easter egg. While the game is in its main menu screen, click in the bottom left hand corner. You will need to be close to the point where the Window Start icon pops up to switch to the Modern Interface. If this happens, just move slightly upwards just until the icon goes away and then click. This also works on the tablet/touchscreen version using a tap instead of a mouse cursor. There are 20 images to unlock. There is also a button to return to the main menu when you are done.