Thanks! I've got him figuring out the prime factorization of the number of the day for school (instead of making up an addition problem), which does encourage him to practice the multiplication facts. It sounds like a similar approach.
On the topic of making your own computer games... DH recently started teaching DS7 to program in a language called KPL - Kid's Programming Language. For more info see:
http://www.kidsprogramminglanguage.com/DS7 is absolutely captivated! The program he wrote last week is half way there to usable as a drill program. I calculates mutiplication facts instead of asking for the correct answers. Hmmm... I see a programming project in his future.
