- Download the Bleeding Edge build #783 of BepInEx 6.
- Extract the contents into the game's root folder. By default, this is
C:\Program Files (x86)\Steam\steamapps\common\OnceUponaKATAMARI.
- Download the Once Upon an Archipelago plugin from releases, and extract its contents into
BepInEx/plugins.
- For Unix (Linux, Mac, SteamOS) users only: add
WINEDLLOVERRIDES="winhttp.dll=n,b" %command%
to the launch options on Steam, under properties.
- Start Once Upon a Katamari to generate the necessary configuration files, and then close the game.
- Open
BepInEx/config/OnceUponAnArchipelago.cfg, and enter the correct server address, slot name and, if applicable,
password.
- Make sure the Archipelago server is running before launching the game.
- Launch Once Upon a Katamari.
- The game will automatically connect on startup. If successful, you will see a message saying "Archipelago: Connected"
at the bottom of the screen.
- If you see a red "Archipelago: Not Connected" in the top left corner: close the game,
check your settings and that the server is running, and relaunch the game.
There is currently no way to reconnect whilst the game is running.
- Start a brand new save file.