Good Online Games which do not require credit card

by Lori R.
(Calfornia)

I am trying to teach my preschooler his letters and is also just starting with learning the sounds as he still doesn't know all of them and he is expected to know them when he starts school in September. I was recommenced an online educational website with a yearly paid subscription to teach
him the letters, numbers, sounds, basically the website has all kinds of educational games, but he does'nt like to play on that website much. Just got bored of those games as soon as I paid for the subscription after the free trial period ran out. So I am basically looking for some good games which will interest him and be useful at the same time. Would you be able to recommend some good online games site especially one that does not require a credit card as i don't want to pay again.....