When you find a pair they are removed from the board and when you find all the pairs in this memory, you have completed the level. Try to remember these images as it becomes easier to find pairs the longer you play. If you can't find a pair, the flipped cards will be flipped back with the face down. Then try to find another card that has the same image as the first. On the game board, there are always two identical images.
The higher the number, the more cards are in the memo game.