Yikes! Either those are some smart 12 year-olds or I'm a little behind the curve, considering that my final exam in programming as a high school senior was to make a Tic-Tac-Toe game in Visual Basic.
The way I learned programming went in this order:
- Logic first: At around that same age with Turtle Tracks.
- Slightly more advanced: I learned some Basic in a math class at around 14.
- Perl: At 18 in community college. My final for that was a web page that would store names and phone numbers and allow adding and deleting.
It seems to me like you're throwing them in the deep end pretty quickly, but then again I'm not exactly a great programmer so maybe it'll work.