Wiimmfi Main Page


The Nintendo Wi-Fi Connection (WFC) service was an online gaming service that provided free online play in various Nintendo DS and Wii games. Nintendo discontinued the service on May 20th, 2014, primarily because the host of the service, GameSpy, was shutting down its servers. Nintendo WFC was required for online play, but the Wiimmfi Project has replicated much of its functionality and allows for continued online play in Mario Kart Wii and other games.

Wiimmfi is available for the public since May 10th, 2014 (10 days before WFC shutdown). It started with Mario Kart Wii and supports now more than 500 games. Read »Development of Wiimmfi« for details.

To use Wiimmfi, the games must be patched to use the new domains and also to change some other settings. See »Wiimmfi Patcher« for more details.


This part is used for announcements. Remember that Wiimmfi is a free service, so please be patient if we stop the servers temporarily to fix bugs or to update the system.

Wiimm & Leseratte

Thursday, May 20th 2021

New easy MKWii Wiimmfi patcher
Today, on the 7th anniversary of the Nintendo WFC shutdown, we are releasing a new Wiimmfi patching method for MKWii and a couple other games that requires nothing but a custom DNS and works on Wii and WiiU. Check out this page for more information.

Log of last updates

Friday, February 26th, 2021

Required patcher update for a bunch of games:
We found a security issue in a bunch of Wii games that needed to be fixed, so you'll need to re-patch your game image again for a lot of Wii games. You'll receive error code 23904 if that's the case for your game. → Details

Sunday, April 26th, 2020

New improved NATNEG speeds for MKWii:
For Mario Kart Wii, the NATNEG (connecting process between players) has been accelerated by a lot, so both friend rooms and worldwide races should now be way more stable.

Tuesday, March 24th, 2020

Removal of the 7-day wait for real consoles:
The 7-day wait for new consoles which was introduced in 2015 is now gone again, if you're playing on a real Wii or WiiU console. As of now, it only applies to Dolphin clients.
Complete change log
NeoRame made this logos.