All Night Nippon Super Mario Bros. – Luigi Game

All Night Nippon Super Mario Bros is a Nintendo-made Super Mario Bros reboot with rearranged levels form both Super Mario Bros and the Japanese Super Mario Bros 2. It was made as a raffle prize for the radio show All Night Nippon with humorous sprite changes to looks like Japanese celebrities. This is a Luigi playthrough, and I only go through world 8-4, I hear getting to the extra stages requires playing through the game 8 times? If you know how to get to the extra levels let me know.