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FUMES DemoNewsFUMES DEVLEAK - COOP and destructible city biome
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FUMES DEVLEAK - COOP and destructible city biome

FUMES Demo · published 29 May 2026, 17:04 UTC

All newsPlayers around this dateRead on Steam

Yoo, we are working on a few different things and we wanted to share some of them.

Also FUMES is currently 30% off, enjoy!

COOP mode

FUMES devs 30 seconds after entering coop for the first time (collisions testing).


This is not an official announcement yet, however we would like to share progress that we made with FUMES COOP.


It will be based on lobbies created by you and your Steam friends. You will be able to join a host game and progress it together. All loot and progress made together will be kept in your single player playthrough.

Max players count

We are designing coop in a way that there is no strict players limit (besides Steams maximum which is ~250), but we aim to make the game perform well and be fun up to ~6 players. More than that will be technically possible, but we can't guarantee that your PC won't explode and game will be fun and balanced.

For example we are bumping amount of enemies for coop, but we have to keep it in sane limits for performance reasons, so that's why playing with a lot of friends might throw game balance out of the window :D

How does our networking work?

It's based on a hybrid approach that mixes server and peer to peer approaches. All damage is also client authoritative, which means that combat should feel quite responsive.

So far, since last update, 602 game files were either changed, moved or deleted. This shows how much we need to modify the game to make coop work and we are still far away from finishing it. Basically, every feature need to be modified to make it synchronize over the network. Also, such amount of changes means that most likely we will introduce a record breaking amount of new bugs (:

City biome

We are also working on a new biome - city. Every building can be destructed. To make it work we created a new destruction tech that lets you chop away parts of the buildings or drive through them and collapse parts of them if chunks below them will be destroyed. On top of that, larger bosses can drive through them causing extreme mayhem (and a lag spike for now).

This tech is designed from the ground up with performance in mind, which is the biggest challenge since there are hundreds of these buildings in the city. This is still early work-in-progress, but so far it performs quite well and just slightly worse than some of the other game areas.

Thank you for your support. We will share more details about coop soon (tm)!

More from FUMES Demo

Other announcements

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In-game event10 Sep 2026Patch v0.21 and upcoming KINDA RALLY update dev leak!Hello Scrappers! We just released a patch with some tweaks, fixes and a save game backups rework. Also, scroll down to get a brand new development leak. Save game backups After last update some of you experienced save games wipeouts which sucks big time . We couldn't track exact cause of this, but we made saving a bit more robust and reworked backups system: · We added Last saves backup folder…Game update17 Jul 2026Five Night Hotfixes at FUMESHello Scrappers! Last night we pushed 4 hotfixes and one more just now, here are changes. HOTFIX 01 · Fix for Harvesters freezing all bullets. · New achievements missing from UI. HOTFIX 02 · Fix of waves of enemies not coming some times. · Fixed some melee enemies spamming errors. HOTFIX 03 · Improvements to joining lobby by code. · Potential fix for some of the crashes when cars are being spaw…Major update16 Jul 2026FUMES CO-OP UPDATE v0.2 IS OUT NOW!ONLINE CO-OP IS HERE! · Invite as many friends as your PC can handle (Steam allows up to 250, but you need NASA PC for that many). · We designed gameplay for 1-6 drivers, but game will try to scale with more people. · All your progress is shared between co-op and single player. · Friendly fire option for annoying your friends. · Progress through the whole game together (except intro and the las…