Atomicrops Online

Online co-op for Atomicrops (2 players). Farm, fight, marry and beat the bosses together in the same world.

• Play over Steam invites or direct IP (LAN, ZeroTier, Hamachi...)
• The host's world is mirrored on the guest: crops, soil, monsters, bosses, loot, chests, shops, effects
• Each player keeps their own character, guns, upgrades, pets and spouse
• Harder with more players: more monsters and more health (adjustable)
• The mod panel follows the game's language (EN, PT, ES, FR, DE)

Installation

Option A — Mod manager (recommended)

1. Install r2modman or the Thunderstore Mod Manager.
2. Select Atomicrops as the game.
3. Search for Atomicrops Online and click Install (BepInEx is installed automatically).
4. Start the game with Start modded.

Option B — Manual

1. Download BepInEx 5 (x64, not BepInEx 6): https://github.com/BepInEx/BepInEx/releases
2. Extract it into the Atomicrops folder, next to Atomicrops.exe (Steam → right-click Atomicrops → Manage → Browse local files).
3. Run the game once and close it. A BepInEx\plugins folder will appear.
4. Create BepInEx\plugins\AtomicropsOnline\ and put AtomicropsOnline.dll inside it.
5. Start the game. You should see the ATOMICROPS ONLINE panel in the top-left corner.

Both players need the same mod version. Different versions refuse to connect.

How to play

Press F8 to show or hide the panel.

Host (the one whose save is used):

1. Click Host game (Steam), then Invite friend (Steam) — or Host by IP (port 27777 by default).
2. Start or continue a run normally.

Guest:

1. Accept the Steam invite — or type the host's IP in the panel and click Join.
2. You are taken to the host's world automatically and follow them between farm and town.

The guest's own save is never written or deleted during co-op. The guest's permanent progress (cornucopias, unlocks) is saved at the end of the run.

Difficulty settings

Edit BepInEx\config\romas.atomicrops.online.cfg, section [Balanceamento] (values are per extra player):

Set any value to 0 to keep the original single-player value.

Troubleshooting

• No panel in game: BepInEx is not installed correctly. Check that BepInEx\LogOutput.log exists and mentions Atomicrops Online.
• Can't connect by IP: the host must open/forward TCP port 27777 (or use ZeroTier/Hamachi). The port can be changed in the config file.
• Something looks different for one player: please report it with both BepInEx\LogOutput.log files (host and guest).

Known limitations

• 2 players only.
• Camp encounters are not scaled by player count yet.