KillNet

Multiplayer for ULTRAKILL, over Steam. Make a party, bring your friends, and play ULTRAKILL's levels together: the same enemies, the same bosses, the same arenas, with voice chat.

KillNet is the multiplayer part of Killcraft on its own, without Minecraft. KillNet and Killcraft players can be in the same party. Its source is here (src/, the launcher in launcher/app): it's the same plugin as Killcraft's, run without Minecraft.

What it does

• Parties over Steam. PARTY in ULTRAKILL's main menu: HOST PARTY (name it, pick how many can join, public / friends / private, cheats on or off), JOIN BY CODE, PUBLIC LOBBIES, or a Steam invite. The party host picks the level and everyone goes there.
• One level for everyone: shared enemies and bosses (one health bar for all), doors, arenas, breakables, the Cybergrind's waves, and the sandbox's spawner arm.
• Voice chat (push to talk, V; or an open mic) heard from where each V1 is, text chat (Enter in a level), player colours, a squad list with pings.
• Spectating when you die, players bumping into each other (the host's choice), PvP (the host's choice), and being put back on solid ground if you fall out of the map.
• Replays: every run is kept. REPLAYS in the main menu lists them with a CASE FILE (rank, damage, secrets, ...); watch them back alone or together with the party.
• MINOS PRIME mode: one player becomes Minos Prime, the rest of the party fights him.
• Your look: V1's colour, lights and wings' glow on a colour wheel, seen by everyone (and on your own arms).
• More of the level shared: trams, hidden switches, fire, boss intros, and cutscene skips by vote.

Since 2.0.2 KillNet's own download is Steam only: none of Killcraft's Minecraft side is in it (no other programs, no local ports, no Discord status). It's the same build as the one made for Thunderstore and Nexus.

Install

Easiest: download KillNet-Launcher-<version>.exe from Releases and run it. It finds ULTRAKILL, installs BepInEx and KillNet, keeps them (and itself) updated, and starts the game. Leave MINECRAFT on OFF.

"Windows protected your PC"? The launcher isn't code-signed (a signing certificate costs money), so Windows SmartScreen warns about any new exe like it. Click More info, then Run anyway. Its source is in this repo (launcher/app) if you want to check it or build it yourself.

Installed with r2modman, Gale or the Thunderstore app? Start ULTRAKILL from there instead: the launcher is for installs in the game's own folder (it tells you if it finds one in a mod manager).

By hand:

1. Install BepInEx 5 into ULTRAKILL: BepInEx releases (BepInEx_win_x64_5.4.x.zip), unzipped into the ULTRAKILL folder. Start the game once.
2. Download KillNet-<version>.zip from Releases and unzip it into ULTRAKILL\BepInEx\plugins\, so you have ULTRAKILL\BepInEx\plugins\KillNet\KillNet.dll. (The settings file is still named after Killcraft.) Updating from 2.0.1 or older: delete BepInEx\plugins\Killcraft\Killcraft.dll, but keep the replays folder next to it.
3. Start ULTRAKILL and press PARTY in the main menu.

Everyone in a party needs the same KillNet / Killcraft version.

Settings

Esc > KILLNET in a level (party, voice, replays, settings), the KILLNET page in ULTRAKILL's OPTIONS, or ULTRAKILL\BepInEx\config\dev.killcraft.cfg.

Building from source

Needs the .NET SDK (6 or newer) and ULTRAKILL with BepInEx installed.

dotnet build -c Release

If ULTRAKILL isn't in C:\Program Files (x86)\Steam\steamapps\common\ULTRAKILL, add -p:GameDir="X:\path\to\ULTRAKILL". The build copies Killcraft.dll into BepInEx\plugins\Killcraft\ (the plugin keeps Killcraft's name; without Minecraft it runs as KillNet).

KillNet's own Steam-only build (what the releases ship), without any of Killcraft's Minecraft side compiled in:

dotnet build -c Release -p:KillNetOnly=true

It makes KillNet.dll; add -p:PluginDir="X:\path\to\ULTRAKILL\BepInEx\plugins\KillNet" to put it where the releases do (with killcraft-shaders.bundle, from a release).

The launcher (launcher/app, .NET Framework 4.8 WinForms): cd launcher/app then dotnet build -c Release. Its pictures come from launcher/design (python art.py, python icon.py; Pillow).

Credits

• Made by goonsn. Part of Killcraft.
• Inspired by UltraLink
• ULTRAKILL by Arsi "Hakita" Patala / New Blood Interactive. KillNet isn't affiliated with them and contains none of their files.

License

MIT