Project Slippi is a set of modifications for Super Smash Bros. Melee, which adds several quality-of-life improvements to the game, of which are commonly used within the competitive scene. Among the most popular mod is Slippi Online, a Dolphin-based mod which allows rollback netcode for Melee over the internet. Other features include the ability to automatically save replays through the Slippi Launcher on PC and on the Nintendo Wii with Nintendont-Slippi.