I created this game, because my kids were bored by flashcards. This was just as easy as flashcards, but they got to jump around like a frog.
To see this game in the capital letter version:
Frog Jump Letter Recognition
Another idea for letter recognition is my new game,
Roll it, Read it! The game has 12 different options and begins with simple uppercase letter identification. The levels progress through short vowel patters, long vowels, and eventually reading simple sentences with r-controlled vowels and the "H Brothers" digraphs.