Unofficial community co-op · Checked July 24, 2026
Choose one current co-op project, give every player the same tested profile, then host through a room code or Steam invite without risking your only save.
Megabonk has no native co-op, but two active Thunderstore projects add unofficial multiplayer. MegabonkTogether is the broader netplay option with up to six players and private or random rooms. BonkWithFriends focuses on Steamworks friend invites and drop-in/drop-out P2P co-op.
Choose one, not both. The host and every client should run the same multiplayer mod version, its declared BepInEx version, and the same set of other enabled mods. Mixing profiles is the fastest route to a failed join or desync.
| Package | Current record | Connection | Players and features | Declared dependency | Important limits |
|---|---|---|---|---|---|
| MegabonkTogether | 5.1.0 Updated Jul 13, 2026 | P2P with relay fallback; private code or random queue | Up to 6 players; weapons, monsters, chests, Shrines, portals and challenges are mostly synchronized; death cam and revival | BepInExPack IL2CPP 6.0.738 | Work in progress; not every mechanic is perfectly synchronized; other non-cosmetic mods are unlikely to work reliably |
| BonkWithFriends | 0.4.1 Updated Jul 8, 2026 | Steamworks P2P; Steam friend invite; no port forwarding advertised | Drop-in/drop-out; world and combat sync; spectator mode, revives and Enter-key chat | BepInExPack IL2CPP 6.0.755 | Active development; synchronization bugs can occur; package page does not promise compatibility with every game patch |
Versions, dates and dependencies above were checked against Thunderstore's package records and packaged README files on July 24, 2026. A package being active does not guarantee compatibility with the next Megabonk update.
Together-5.1.0-test.Download boundary: use the original Thunderstore links in the comparison table. Avoid reuploads, unknown launchers, password-protected archives and installers that ask for Steam credentials.
Do not combine projects: MegabonkTogether and BonkWithFriends implement different networking and synchronization layers. Put them in separate profiles if you want to test both.
Record the Megabonk version before testing. Launch vanilla once after an official update.
Match the exact multiplayer package and its declared BepInEx IL2CPP dependency on every PC.
Start with only the multiplayer package and required libraries. Add cosmetic mods only after a clean test.
MegabonkTogether 5.0+ documents experimental Proton/Steam Deck cross-play. Do not assume every mod has the same support.
MegabonkTogether marks shared experience and save progression options as experimental. Keep a backup regardless of the selected mode.
Do not submit multiplayer or other gameplay-changing mod runs to official leaderboards.
MegabonkTogether's author recommends copying the save before installation. With the game closed, back up:
%USERPROFILE%\AppData\LocalLow\Ved\MegabonkVed\Megabonk folder to a separate dated location.Use the Save Recovery Guide before overwriting an active save.
| Problem | Likely cause | What to check |
|---|---|---|
| No multiplayer button | Vanilla launch, loader failure or wrong plugin location | Launch from the manager; confirm the package and declared BepInEx dependency are enabled; read the manager log. |
| Invite or room code fails | Different versions, Steam offline, firewall or relay/direct connection problem | Compare every profile version; restart Steam and the game; allow the game on the active firewall network; retry with only required packages. |
| Players see different enemies or rewards | Desync, unsupported mechanic or conflicting gameplay mod | End the run, remove non-required mods, restart all clients and test a fresh room. |
| Crash while loading the map | Known WIP behavior, stale dependency or another mod conflict | Restart once, then reproduce with only the multiplayer package. Check the package's current issues if it repeats. |
| Works for host, not client | Profiles are not actually identical | Compare package versions and dependencies line by line, not only profile names. |
| Stopped after a game update | Patch changed code expected by the loader or mod | Launch vanilla, preserve the old profile, and wait for a compatible package update rather than forcing the old DLL. |
Stop testing on the main save if progression, inventory, unlocks or currency differ after a session. Preserve both the current save and dated backup before attempting recovery.
Yes. MegabonkTogether 5.1.0 and BonkWithFriends 0.4.1 were active Thunderstore packages when checked July 24, 2026. Both are unofficial.
Choose one. MegabonkTogether offers up to six players, room codes, random queues and an experimental Proton path. BonkWithFriends focuses on Steam friend invites and drop-in/drop-out P2P.
Yes. Match the multiplayer package, version, BepInEx dependency and all other enabled packages.
BonkWithFriends advertises Steamworks P2P without port forwarding. MegabonkTogether uses P2P and provides relay fallback when direct networking fails.
No. See the official multiplayer status FAQ for the vanilla game.