I was thinking a random number generator, as a rule. (to make things different each time) You could have something like this
"do" random number generator, numbers between whatever. (users choice, one of those boxes you type into.)
"if" number generated = 1, load level 1
"if" number generated = 2, load level 2
etc
this could also be used to choose a random character, make it so when your touching an enemy sprite, a random amount of health between say, 20 and 30 could be taken away, possibly even a less predictable "computer player" (follow random paths, random enemies in certain spots, shoot random types of bullets, have random speeds) or whatever else.

I'm not really sure if something like this is in SGDK 2 already, but I haven't seen it, so I suggested it.
