The all in one NES/Famicom/Dendy Emulator
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Super Mario Bros 3 in FCEUX


FCEUX is a Nintendo Entertainment System (NES), Famicom, Famicom Disk System (FDS), and Dendy emulator. It supports NTSC (USA/JPN), PAL (European), and NTSC-PAL Hybrid modes. It supports both Windows and SDL versions for cross compatibility.

The FCEUX concept is that of an "all in one" emulator that offers accurate emulation and the best options for both casual play and a variety of more advanced emulator functions. For pro users, FCEUX offers tools for debugging, rom-hacking, map making, Tool-assisted movies, and Lua scripting

FCEUX is an evolution of the original FCE Ultra emulator. Over time FCE Ultra had separated into many distinct branches.

The concept behind FCEUX is to merge elements from FCEU Ultra, FCEU rerecording, FCEUXD, FCEUXDSP, FCEUXDSP CE, and FCEU-mm into a single branch of FCEU.

As the X implies, it is an all-encompassing version of the FCEU emulator that provides the best of all worlds for the general player, the ROM-hacking community, and the Tool-Assisted Speedrun Community.

For more details see the version history

You can find out what we've been up to since the last release by checking the commit browser.
We also have an IRC channel #fceu on irc.libera.chat


Latest Release

FCEUX 2.6.6
26 August 2023

The 2.6.6 release is mainly a maintenance update for the mappers and emulation core with a few new features added in.
Some of these new features apply only to the Qt/SDL version of the GUI.

Full changelog

Windows Port Debugging Environment for Version 2.2.0
FCEUX as a debugging environment

Qt/SDL Port User Interface and Debug Tools for Version 2.6.0
FCEUX Qt/SDL Debug Tools