I decided to add a few more titles to the hidden stuff section, again there's just too much to list and the list sure is packed now.

Check it out here http://www.nesworld.com/hidden-stuff.php

If you know of a game that isn't listed that has hidden stuff included, then please do let me know. Also, I know there are a lot more available if you do a google search, but I've found that around 1/3 of what I've found on "cheat" sites doesn't actually work.