Nintendo Entertainment System cheat codes

Codes for the Nintendo Entertainment System, filed against the exact build of each game rather than its title. Codes for this machine are filed by whichever device produced them.

Which device the Nintendo Entertainment System used

Codes for the Nintendo Entertainment System come from the cheat hardware sold for it, and the device a code was written for decides how it must be entered. Every code here records that format, because a code without one is a string of hexadecimal nobody can place.

Region and revision matter more here than the game’s name

A Nintendo Entertainment System game released in Europe, North America and Japan is three separate builds with memory in three different places, and a later revision can move it again. A code that is correct for one is usually wrong for the others, and being wrong means writing an arbitrary value wherever that address happens to point. Every code is filed against the game, region and revision together.

Playing the Nintendo Entertainment System in a browser

The Leumas Consoles deck runs the Nintendo Entertainment System in a browser tab using media you already own, so a code found here can be tried in the same session. Leumas supplies no games — you bring the cartridge or disc you have.