http://kayin.pyoko.org/iwbtg/
This game will make you cry and invent new swear words never before heard of in the history of civilization. It's a free download, but those who are not good at such ROM hacks as Kaizu Mario (mistranslated as A****** Mario) should pick up the demo instead. The first screen will make you cry, seriously.
If you want to cheat and figure out the way, run a search for cloud8745's "I Wanna Be The Guy" videos. Though, if you are offended by harsh language, don't watch.