Those are like puzzle

If your kid is under 6 years old, those cards are so fun for your kid. Kids start
with 3 letter words at first. They don’t care for letters and just enjoy pictures,
but when kids put 3 right cards and make right picture, you must turn over
and say letters behind. This is very important for kids. My son loves puzzle
and he is into those cards, however, too many cards make him confuse to
pick up right cards and he trys to give up. At that time, I save 2 cards he has
already got and looking for the last one, and ask him if he finds a missing one,
even he is working on another picture, he can pick it up and make them perfect.