Load levels made on Rude Level Editor. Levels are available online and can be downloaded in game. Records can be posted on the leaderboard, separated from the official steam leaderboard.
With Vanity Reprised, you can use your copy of Ultrakill to generate a Unity project for building your own custom levels. If you want to publish your levels on the online catalog, see pinned message in the #ultrakill-modding channel of the New Blood discord server.
Older levels (pre-revamp update) are separated from post-revamp levels due to compatibility issues. Older levels can still be downloaded if ULTRAKILL is downpatched to the violence update and correct versions of Angry and Plugin Configurator are used.
Install r2modman and install the plugin trough the user interface
Put both PluginConfigurator and AngryLevelLoader folders (not zips) in ULTRAKILL/BepInEx/plugins.
PLUGIN CONFIGAngry Level LoaderOnline Levels to download levelsNote: you can also access the main panel from the act select menu