"But...so little text files aren't allowed, too? Also, when they've been generated at runtime, at the first game-start?"
Only source code files are allowed.

If you generate something procedurally feel free to do that and use it any way you like it.

A small array that stores (let's say) 10-20 elements is ok; just don't dump a bitmap into an array and recreate it from there, etc. The general rule of the contest is to create something interesting out of nothing; the demos that try to trick the jury won't have too many chances to win.

Larry, you've got some great ideas! I have quite a bit of fun playing Sumotori