Amazing Story about Joel and TimezAttack

I have this computer game for the older kids called TimezAttack. In the game this little green alien is wandering through the dungeon killing large ogres by answering (quickly) multiplication problems. Joel really wanted to play even though I explained to him that it was too hard for him. Well, he started playing it anyway. I though he was just messing around but one day I stopped to watch and he was actually answering the problems CORRECTLY. He would start a screen and when he answered them wrong it would show him the correct answer. When he would come back to that problem he would remember the correct answer. I am totallly amazed. My 4 year old son has memorized about half of his multiplication facts. He doesn't know what they are. He thinks 27 is 2 7. But still! This program works!!!! I wish they had a game for addition.