ATLYSS Archipelago

Archipelago randomizer implementation for ATLYSS. Enables multiworld randomizer gameplay with 165+ randomizable items, quest and level-based location checks, and configurable progression options.

Installation

Step 1: Install Archipelago

Download and install Archipelago 0.5.0 or later from the official Archipelago releases.

Step 2: Install the World

Place atlyss.apworld in your Archipelago installation folder under lib/worlds/ or custom_worlds/.

Step 3: Install BepInEx

Download BepInEx 5.4.23.4 and extract it to your ATLYSS game directory. Run the game once to initialize BepInEx.

Step 4: Install the Mod

Place the DLL files from the Plugin folder into ATLYSS/BepInEx/plugins/. If installing via Thunderstore, the mod will be installed automatically.

Step 5: Connect In-Game

Enter your server address, slot name, and password if required. Launch ATLYSS and press F5 to connect to your Archipelago server.

Configuration

The mod supports several gameplay options configurable through your Archipelago YAML:

Goal Options: Level-based progression (4, 8, 16, 24, or 32) or boss defeats (Colossus, Galius, Lord Kaluuz, or Valdur)

Area Access: Locked portals requiring items, fully unlocked areas, or progressive unlocking

Shop Sanity: Optional randomization of shop inventories

Credits

This project was made possible with help from:

• AtlyssModdingCentral Discord server
• Mickemoose - Technical assistance and code contributions
• Catman - Guidance and project support
• Nichologeam - Coding Partner (major help with this project)