Here's a simple Hangman game i've made for my 6 years old son.
The questions are Addition of 1 or 2 digit numbers. The app shows the current
score, and in case of a wrong answer - throws a childish insult at you :-) Insults
are in Hebrew, currently - but it's fairly easy to modifiy them to English or
even eliminate them at all.
Have fun with the kids! :-)