Vowels Whack-a-mole. Online vowel game for children with the moles. Children have to hit the moles that show vowels, lowercase or uppercase. Look at the letters of the alphabet shown by the moles and click on the mole showing a vowel to review letter knowledge. Don't click on the consonants if you don't want to lose points. Each level you improve, more moles appear to help you learn the vowels, as well as more quickly.