Project 64k is a modified version of the Nintendo 64 emulator, Project64 (version 1.4). It was originally created by Hotquik and is currently developed by Smasherx74. Project 64k is compatible with Microsoft Windows operating systems. The main purpose of Project 64k is its "netplay" (online multiplayer gaming) capabilities, due mainly to the integration of the Kaillera networking client which enables online multiplayer gaming. Players are able to join game servers where multiple games may be hosted. This ability is not possible with Project64 at this point in time, due to the lack of online gaming capabilities. However, Project 64k, shares many underlying similarities with Project64, such as with system requirements and emulator core compatibility with games, as well as cheating facilities, via GameShark code emulation.
 In Super Smash Bros.
Project 64k is commonly used in the SSB community as a means to play online. The most popular server is the Galaxy 64 server in Chicago. Due to being the only practical means of long-distance play, it is often used to host online tournaments, similar to online tournaments in Super Smash Bros. Brawl. Because of the impracticality of executing professional techniques using a keyboard, many players resort to controller plugins to give an experience similar to actual play. Note that through an emulator, access to hidden elements of the game such as the debug menu are easier.
Project 64k has a number of unresolved issues and drawbacks. The most prominent of these include:
- Plugins; in some cases the emulator requires specific plugins for operation. In addition, interoperability with input plugins can cause issues (as well as issues with Rumble Pak, and Controller Pak emulation can be present).
- Internet speed requirements; the emulator has high internet connection speed requirements when using the net play feature.
- Computer crashes; there are some unresolved issues which can cause the emulator to cause a crash, requiring a restart for continued operation. Most of the time, this is a side-effect for using too many GameShark codes at once. In addition, issues with the Kaillera client software can also create crashes.
- Unreliable server communication; occasionally, when using the net play feature, the server can de-synchronise or disconnect. This can also often manifest with game desynchronisation too, with hosted multiplayer games desynchronising.
- Wifi Lag; most people without perfect connection will lag the game. Many people play online with their lag and this can annoy others. This is one of the reasons why p2p is getting more popular. The other reason is due to button lag during/not in online play.