These are some Game Genie codes for Super Mario Bros. on the NES that I thought were cool, presented in no particular order,
these were all tested on hardware with the SMB+Duck Hunt cart.
This code fucking rules, the music is all messed up, enemies behave strangely sometimes,
and best of all, hitting a block causes the rest of the level to be all messed up, each time is different.
I would recommend using an infinite jump code like SEEULGSZ or AEPLLG,
be warned that this code is highly unstable, and is prone to crashing, I remember there being an anti-crash code,
but I can't seem to find it anymore, but if you can, I'd use that too.
Every enemy behaves like the last powerup you grabbed, including 1-Up's
If you've messed around with Game Genie codes, you know about YEAAAA and the many variations of it, if you don't, go try it, right now, it is indescribable.
Some of my personal favorite variations are SEAAAA, NNAAAE, ZEAAAA, ZXAAAE, and PEAAAE.
This one has a few effects, but the main one is that the music sounds like crap.
This one makes things move really fast, including yourself.
This one makes the music sound like an infant with a piano.
Classic. Enemies appear where they shouldn't
Mario can only move when he jumps.