jesta
Moderator
Super Mario Bros. 3’s Lost Levels
Levels that you were never meant to see are hiding in your old NES copy of Super Mario Bros. 3. Luckily, if you’ve still got a Game Genie, you can unlock them and try them out for yourself. A lot of these “lost levels” aren’t anywhere near finished...
I couldn't believe my luck when I read this article. For I still have my original copy of SM3 and I still have my Game Genie from all those years ago, and I had no idea about these codes lol
Lost Waterfall Level: You’ll need to swim up a series of vertical waterfalls to make your way to the end of this stage. It’s an interesting concept, but keeping Mario lined up with the waterfalls is a bit of a pain. Could this be why this stage was not included in the final game?
Game Genie Code: AZXUAGPX, APNUGGXE, NZNUIKUU
Lost Plains Level: This is a two-tier level. Head down the pipe to your left to reach the lower tier and you’ll find some Goombas hopping around in Kuribo’s shoe on your right.
Game Genie Code: UZSLZGYX, OGSLLGSG, GGNUGGXE, NZNUIKUL
Lost Plains Level 2: An interesting level that has you running to the right on its upper tier, and swimming to the left on its lower one. Once you reach the end, you’ll find a pipe that drops you off in a coin-collecting cloud stage.
Game Genie Code: PZSLZGYZ, XGSLLGSG, KZNUGGXE, OZNUIKUU
Lost Hills Level: Some fans have speculated that this stage might be an early version of area 7-3, due to the similarities in their designs. Have fun and try not to die.
Game Genie Code: LZXUAGPZ, SINUGGXE, ELNUIKUL
Lost Underground Level: This underground area seems to feature some placeholder art for the large door at the beginning of the stage. Check it out for some spelunker-friendly moments.
Game Genie Code: LZXUAGPZ, ZGNUGGXA, KLNUIKUL
Lost Icy Level: In this short and slippery area, you’ll have to navigate icy blocks that rise and fall while keeping up with the right-scrolling screen.
Game Genie Code: AOZULT, GGGGGGGG
Link
Levels that you were never meant to see are hiding in your old NES copy of Super Mario Bros. 3. Luckily, if you’ve still got a Game Genie, you can unlock them and try them out for yourself. A lot of these “lost levels” aren’t anywhere near finished...
I couldn't believe my luck when I read this article. For I still have my original copy of SM3 and I still have my Game Genie from all those years ago, and I had no idea about these codes lol

Lost Waterfall Level: You’ll need to swim up a series of vertical waterfalls to make your way to the end of this stage. It’s an interesting concept, but keeping Mario lined up with the waterfalls is a bit of a pain. Could this be why this stage was not included in the final game?
Game Genie Code: AZXUAGPX, APNUGGXE, NZNUIKUU

Lost Plains Level: This is a two-tier level. Head down the pipe to your left to reach the lower tier and you’ll find some Goombas hopping around in Kuribo’s shoe on your right.
Game Genie Code: UZSLZGYX, OGSLLGSG, GGNUGGXE, NZNUIKUL

Lost Plains Level 2: An interesting level that has you running to the right on its upper tier, and swimming to the left on its lower one. Once you reach the end, you’ll find a pipe that drops you off in a coin-collecting cloud stage.
Game Genie Code: PZSLZGYZ, XGSLLGSG, KZNUGGXE, OZNUIKUU

Lost Hills Level: Some fans have speculated that this stage might be an early version of area 7-3, due to the similarities in their designs. Have fun and try not to die.
Game Genie Code: LZXUAGPZ, SINUGGXE, ELNUIKUL

Lost Underground Level: This underground area seems to feature some placeholder art for the large door at the beginning of the stage. Check it out for some spelunker-friendly moments.
Game Genie Code: LZXUAGPZ, ZGNUGGXA, KLNUIKUL

Lost Icy Level: In this short and slippery area, you’ll have to navigate icy blocks that rise and fall while keeping up with the right-scrolling screen.
Game Genie Code: AOZULT, GGGGGGGG
Link