Endless Alphabet is a FREE iPad app that allows users to spell words like contagious, cooperative, and belch.  Kids have to put the letters in the correct order to spell the words.  Each word features an interactive puzzle game with talking letters and a short animation illustrating the definition.  My 3 year old daughter loves this game and has added many new, big words to her vocabulary.  This app will teach alphabet letter sounds, spelling, and word definition.  If this app wasn’t free I would pay for it.  Great for Pre-k kids and up!