Flip the cards and find the pairs.
Memory Match is the classic concentration game with a twist: the pairs are not always identical. Depending on the level, a card might pair with its written word, with a group of that many objects, with a word that rhymes with it, or with a sum that equals it. That turns pure visual memory into memory plus a small piece of reasoning.
The 5-7 level moves to six pairs and introduces picture-to-word, rhyme and quantity pairings, so finding a match means reading or counting as well as remembering.