I was thinking one where you have to get a person to an exit, but he's trying to go to another area. so you click to create blocks, and make the guy have to go to the exit. Here's a diagram: blocks= x
Good exit x x Bad exit x <<<<<< guy moving left
he tries to get to the bad exit, so if you place the blocks like that, then he will get to the bad exit. Hope that helps!
Here's a game. a guy is falling, and you have to create blocks to get him to the exit. he will try as hard as he can to get down. Here's a picture. block=x
start x x xx xxxxxx finish
so he will start at the top,fall onto a block, try to go both ways, find that he can only go left, and get to the finish.