Project64k is a modified version of the Nintendo 64 emulator, Project64 1.4. It was originally created by Hotquik and is currently developed by Smasherx74. As a Nintendo 64 emulator, the program has the ability to run Super Smash Bros., as well as a majority of the Nintendo 64's library. Unless the user has an N64 controller adapter for PC, they will generally be using a keyboard to play.
Compared to other emulators of its type, including Project64, Mupen64Plus, 1964, and other projects, Project64k remains one of the most commonly used emulators in the Smash community due to its built-in ability to play its games via the Internet with Kaillera. As a result of this, a majority of online tournaments for Super Smash Bros. are held with the emulator, especially due to the large size of The Galaxy dedicated server. Despite this, Kaillera's capabilities have been criticised for lag problems, though these have since been abated by the rise of player-to-player connections.
Outside of these facilities for netplay, the emulator has also been popular for its use in tool-assisted superplays, due to its extensive hacking capabilities that feature compatibility with GameShark and Action Replay, and other features, such as frame-by-frame play.