So I want to have a bonus level for GoSub every 10 levels, so it breaks up the action and makes it less monotonous. But I have no idea what the bonus level could be. Should I have a points system for the game? Should I add some lives as well? I think I will. I have lotsa room for mazes, so I want there to be at least 100 different ones. The bonus level could get you a chance to add more lives. But what should the bonus level consist of doing?

I have 3 more levels to design before I get there, so I will have to decide what to do in that regards pretty soon.