If you’re familiar with the NES, you’ll know how much more difficult video games used to be. They required a lot of practice and dedication to see through to the end.
That is, unless you have a Game Genie…
Back in the day I used to sit in front of my TV and create weird codes for my favorite NES games. The original Super Mario Bros. was most fun to create codes for.
Normally you’d use the Game Genie to give yourself more lives, infinite health, or infinite ammo. Not so normal uses (and what absolutely fascinated me) were to change level designs, alter the appearance of sprites, and cause other unexpected things to happen.

In the 1990s I would create and collect these strange codes. I had a Geocities website where I would post them to.
On this page I have reposted all the codes from my old website:
Super Mario Bros. 1 – NES
KAGKAL: unbelievably fast goombas
NNAIKE: all power ups and stars kill you
ILOVET: Mario’s mouth opens and closes like Pac-Man when he walks
VILLGI: Mario walks backwards
IONATX: Beetles replace goombas
TXEPAG: weird bricks, more fire flowers in some worlds (1-2)
STAGEO + SPEPNY: extra difficult (koopas have hammers etc…)
KOYNAN: no sound when Mario jumps
OPASSE: 1up mushrooms are now power ups
AKEOIP: weird level
VELITT: power ups disappear when hit, very few enemies
OVILLV: when you shoot a fireball, Mario makes the motion, but nothing comes out
GALLSS: when you hit a 10-coin block, only one coin comes out
SONETX: you control the demo
OKENGX: really weird
EKEOTO: invincible
EOXNTI: weird sound FX – coins
AOXNTI: another weird sound for coins
PETEEE: no background, just foreground
TOSXUN: The screen scrolls along with you and part of it disappears. I can’t describe it.
EGENIE: Mario skates
XGONLY: Music starts and stops
AXEAXP: backgrounds change colors
IENTIA: 1UP mushroom floats in air
VXATSA: you see the enemies left of your screen when they’re really where they should be
OVEKSX: when you stomp enemies, they die but keep on moving
TVASNA: you appear invincible when you get a star, but you can still get hurt
USXEOX: when you hit a block, the block stays unharmed, but the thing inside still comes out.
ESTONE: The pipes you can go down look normal, the others look screwed.
XESTON: Mario looks like Luigi
VOIGEP: Enemies go through pipes, power ups fly to the left
PKONTX: When Mario faces left, he looks normal, when he faces right he looks weird and he can go behind background
VOULOS: Nothing comes out of any of the blocks
OPOISO: cannot be harmed by enemies but you can still stomp them
TOUSSA: You cannot stomp goombas or you’ll turn small or die
NOKEAG: Some power ups and stars give you 1ups, hitting red koopas makes weird things happen
OLUNTE: Appear big when you run
XANOPO: no time
TOANPX: Mario is crazy!
KEKAKE: no backgrounds and foreground
INTOAS: weird level, but it works
KYOUGK: Mario falls left instead of right on flagpole
TXEEON: time resets itself to 409 when it reaches 400
SEIING: when Mario hits a block, it becomes nighttime
STAPTO: no music
SEPUEG: when you hit the 1st mushroom block, coins fall from the sky, but you can’t get them
SPEPNG: weird level
POPPOK: No Clouds
PSTIOO: Every Enemy Hit Is Worth “1 UP”!!!
PZZONO: Go down any pipe
ZEEOPO: 50 extra seconds
IVYENO: all enemies look like Koopa
PINAAO: Move in pause
SSASSA: Always starman
YAZYIG: Random teleporting
PAZSNO: Always have fireballs
PIGNAX: Invisible
EATSSY: Walk through things
OOTAAA: strange effects
AAAAAA:strange effects
POTEXX: Things turn to 1/2 when hit
TIKOAO: Swim without water
EVYIVY: Everything bounces
OPKOPK: Scenery in sky!
IAGPSK: Warp to 4-1 /w/ no Lakitu (Yeah!)
PIGPEG: World with no enemies or elevators!
PAZSNO You can always throw fireballs
ZIGGYY: More enemies
SKIINO: Enemies don’t die
Super Mario Game Genie Code Resources:
For more codes, check out the following Super Mario Bros. Game Genie code pages:
http://www.freewebs.com/smb1/ggcodes.html
http://www.themushroomkingdom.net/smb_ggcodes.shtml
http://www.gamefaqs.com/nes/525243-super-mario-bros/faqs/3098
Wayback Machine Archive of http://www.trsrockin.com/smb_glitches.html
No.1 at game genie codes is smb1. Thay are so awesome that u may cry laughing at them.
@killgruz do the top ten other weird super mario brothers game genie codes!
soooo looong game genie
Can you vote on my list for your favorite mario game
Here is the link: http://www.fasttopten.com/topic.aspx?t=a01b3a939be648038594b76ee11cce95
NOOOO!!!! The code I was dying for (Mario looks like Luigi) is the only one that doesn’t work! NOOOO!!!!
I discovered a new Game Genie code for SMB1:
LRLFLS – When collecting a powerup or stomping a enemy the Score Obtainer bar goes up faster (i mean the ones that say 1UP, 1000, 100, 200, etc) but while hitting a coin block it goes up at the normal speed
6:28 SEVERE CORRUPTION LATER… ERROR NES CORRUPTED NOW EXPLODING IN 5,4,3,2,1,DFDGYNSDYFUGFVSGYUBFBSGVYBGYBFVS,0…
BOOM! HAHAHA!
I was watching a 256 world video and I discovered a new game genie
AEPLLG: Jump Infinite Times
Can We Do It With FCEU
eu tenho fceu
Try SUKSUK, your game will crash when you jump to any block above mario.
what’s anther code for SONETX?
where are the missingno. jokes? 😉
WHYWHY- Turns all words green.
GFDGWD- Turns Super Low Gravity for every Enemy INCLUDING Mario.
Oh, and these were my own creation.
this code PINAAO is invalid
AAANAY: Forcing the game to start makes Mario invisible and the game freezes. Turning the code on during gameplay does the same but Mario doesn’t turn invisible.
AEPLLG + AETLTK = moonjump like you do in the Action Replay.
GPILNK – Some powerups are missing, others will fall from the top of the screen after you hit the block. Might make a full game run more interesting.
GOATSE: Though it shares the name of the infamous shock site, this code provides an interesting effect and a great deal of challange. Enemies and some objects are invisible, but their graphics and animation appear on the left side of the screen.
I like NAPSIN 😀
YEAAAA=HGFJKSLDHGJSKDHGJKFGHKJDGHSKJGFHSKFJDHGKJDSHGJDKSHGJKSHGJKLHGUIDFHJKHBGDKJGHDGSKJHGSLKJDF 🙂
Hey can you link to your old website? I want to check it out.
deos anyone know if Game Genie Codes for Super Mario Bros work with SMB Duck Hunt?
@TheHylain
XXXAKA – Only play Duck Hunt.
PEOAAA – The game goes directly to Duck Hunt.
ZVZEIE – Pressing start resets.
SOLALI:Mario’s form resets back to Small without changeing size when the level/level segment changes, i tryed somari but no m and r so solali it is
if you use PZZONO + PIGPOG + NAPSIN +NULTKA its so damn funny. and if you check all the pipes, you can warp to 2-2 and then finish it you go to 1-4 then fight bowser (NO BOWSER!!!) you just go to 2-1!
My creations
PIGSUP – The game doesn’t stop if you die via enemy. The clock will freeze and sometimes the screen but it only lasts a few seconds before everything will move again. You will get the death music but still be alive. Falling into pits and lava kills you, Time up is broken so you need to turn the code off during play if timed out.
GSLLEK – Mushrooms will move randomly but are easier to get.
GELLEK – Frozen mushrooms
SINPLS – only use once then turn off when you die…
On world 1 – 1, go down the 1st pipe for an infinate coin room. Eventually the time will run out, turn the code off and then enjoy near infinate lives.
PIGPOG – This is a really great Game Genie code that results in all sorts of fun and random errors, but the graphics remain clear and normal.
If PINAAO doesn’t work, then try PIYAAO