This is an easy game based on the old card game called "Memory" (or "Concentration"). Choose how many players from the drop-down box, and then take turns to click on 2 cards until you find all the pairs. Click and hold to see the card for longer.

You can play by yourself (try to find all the pairs in as few attempts as possible), or play with a friend and see who finds the most pairs. You can even play with your whole class, split into 3 or 4 teams. See full instructions here.