I just came across an exciting game to teach/familiarize kids with letters, numbers, or shapes.
business cards, paper clips, box, string, magnet
Write a letter, number, or shape on one side of each business card, Attach a paper clip to the top of the cards. Put the cards in a large box, face up. Make a fishing pole out of the string and magnet. Call out a letter, number, or shape and have your child fish for it.
I found this activity in a book called 365 games smart toddlers play by Sheila Ellison. This activity is on page 145.