Vixle: A game engine that teaches kids to code

I'm curious as to why it should be hidden from them. Hiding source is the perfect way to create a "them and us" environment. "Sure, go and play and code away in your little sandbox but don't ever expect to understand how and why things in the game are achieved. That's real programming."

As a secondary note, I "expect" to be able to see source as they "expect" me to run their code on my computer.