Originally posted by Brian:
How do you know whether you found all the exits to each level? In super mario world, red dots on the overworld signified multiple exits, does something similar exist for this? And how do you access the cannon things that are scattered throughout the overworld map?
You know where secret levels are located by finding lone dots on the world map that aren't connected to a path you've traveled and aren't mushroom houses.
In this picture, it's a cannon. You access it by finding secret exits in adjacent levels. So the secret exit must be in one of the 2 levels that have an arrow coming out of it.
You can pretty much tell that the secret exit must be in the level 1-Tower or the one to the right with the flying Question Mark Block above it (because those are the levels next to the cannon and the ones that could connect to it).
![[http://images.geekazoids.net/nsmbsecret_copy1.jpg]](http://images.geekazoids.net/nsmbsecret_copy1.jpg "http://images.geekazoids.net/nsmbsecret_copy1.jpg")