Screenshots
Watch trailer on Steam ↗Shroom Siege
Upside Down Bird · Published by Upside Down Bird · Official site ↗
Last updated 27 Sept 2026
Battle for control of a fungus-infested Kingdom in 4v4 strategic multiplayer matches. Possess specialized insects, working together to reach a Shogun, Shrine, or achieve a Poop Victory (yes, you read that right .. Poop Victory). Shroom Siege is for both new and experienced fighters!
Action, Indie, Strategy, Sports · More free games
In Shroom Siege, work together or compete against three others as unique insects battling for dominion over a fungus-infested realm. Strategies unfold across various goals like reaching the Shogun or achieving an unexpected Poop Victory.
About this game
Just Updated
🎮 Shroom Siege Demo Now Supports Cross-Play! 🍄⚔️
Big news, warriors of the mushroom kingdom! 🌟
The Shroom Siege demo has officially launched on Xbox as part of the Xbox Indie Selects Demo Fest 2025, and we’re thrilled to announce that it now features full cross-play support with the Steam demo!
That means whether you’re playing on Xbox or PC (Steam), you can now team up with your friends or battle against rivals across platforms in epic 4v4 matches.
✨ What’s New:
🔗 Cross-Play Multiplayer – Steam + Xbox players united
⚔️ Bigger Community – More warriors, more chaos, more fun
🚀 Jump in Now – The demo is live and waiting for you
This is just the beginning—your feedback during this demo period will help us polish and balance the battlefield before the full launch.
So grab your sword, rally your squad, and get ready to siege together, anywhere!
About the Game
Manipulate a swarm of insect minions in fast-paced, team-based battles. Coordinate with fellow fungi to outwit opponents and fight for a taste of victory! Inspired by arcade hits like Killer Queen, Shroom Siege offers easy-to-learn gameplay mechanics and Japanese-inspired ink-wash designs, providing depth and complexity for seasoned shrooms.
Join the fight from wherever you are! Whether you’re sharing a couch with future rivals or hopping into a match from across the world, Shroom Siege remains dynamic and tailored to each unique gaming setup.
Bring the entire community together with cross-play across Steam and Nintendo Switch platforms. It’s always a good time for a siege, regardless of location, platform, or setup!
Taking cues from the arcade hit, Killer Queen, Shroom Siege introduces its unique gameplay mechanics. It's a game that's easy to pick up, yet offers depth and complexity for those who crave a strategic challenge.
Claim victory in one of three ways:
Shrine Victory: Deliver spores to all shrines across the map and maintain control of every shrine to succeed!
Shogun Victory: Possess a Shogun warrior and defeat the opponent’s Shogun thrice!
Poop…Victory?: Push a giant dung ball from one side of the map to the other to claim this satisfying victory!
An insect minion must be possessed and controlled by a shroom at all times, adding an additional layer of complexity to each battle.
Dive into fair and engaging battles with Shroom Siege’s balanced matchmaking system, which pairs teams of similar skill levels. Both fresh and seasoned aspiring fungi can find matches challenging and fun for both parties.
Designed with controllers in mind, Shroom Siege is playable via keyboard and mouse, as well as controllers of all types. Find the winning playstyle with a simple control scheme accessible for all players!
Shroom Siege offers a balanced blend of strategy, action, and fun. So, gather your friends or join the online community, and let's start the siege!
System Requirements
Will my PC run this? →Minimum
- OS *: Windows XP SP2+
- Processor: SSE2 instruction set support
- Graphics: DX9 (shader model 3.0) or DX11 with feature level 9.3 capabilities.
- DirectX: Version 9.0
- Storage: 800 MB available space
Supported Languages
Latest news
Patch NotesOfficial
Cross play with Xbox Update
🍄 Shroom Siege Demo Now Cross-Play with Xbox! ⚔️Big news, mushroom warriors! 🌟The Shroom Siege demo is now live on Xbox as part of the Xbox Indie Selects Demo Fest 2025 — and starting today, we’ve added full cross-play support with Steam!That means whether you’re defending shrines or pushing poop with your trusty beetle, you can now team up with friends across Xbox and Steam in chaotic 4v4 online battles.🆕 What’s New:🔗 Cross-Play Multiplayer – Steam + Xbox players, united in battle⚔️ Bigger Community – More warriors, more action, more mushroom mayhem🗺️ Two New Maps Added to the Demo! – Fresh battlegrounds to explore and conquerThis is just the beginning—your feedback during the demo will help us fine-tune balance and prepare for the full release in 2025.👉 Play the Demo on Steam🍄⚔️ Siege together, anywhere!🍄 NEW MAPS!!!! 🐝🐝🐝🐝🍄 🌸🌺🌼🌻🌷🌹🍄🍄🍄🍄Read full article on Community Announcements (Upside Down Bird)AnnouncementsOfficial
Let's Play with Shroom Siege Devs
Join us for a special live stream event where you'll have the opportunity to interact directly with the creative minds behind Shroom Siege! This event is your chance to dive deeper into the world of Shroom Siege, ask burning questions, and get a sneak peek at what's coming next. What to Expect? Live Gameplay with Developers Watch as the developers themselves step into the vibrant world of Shroom Siege! You'll see them strategize, coordinate, and go head-to-head in an exciting 4v4 showdown. As they play, they'll share insights into the game's mechanics, strategies, and the inspiration behind it all. Interactive Q&A Session Have questions about the game design, strategies, or future plans? This is your chance to ask! Our developers will be answering your questions live. Whether you're curious about the inspiration behind the game, have questions about advanced strategies, or want to know more about upcoming features, this is your chance to ask directly. We will be monitoring our Discord server for messages Sneak Peeks and Surprises We have a few surprises up our sleeves! You'll be among the first to hear about upcoming updates, new features, and future plans for Shroom Siege. Don't miss this chance to get an exclusive look at what's coming next. Who Should Attend? Whether you're a seasoned player looking for advanced tips and strategies, a newcomer wanting to learn more about the game, or simply a fan of Shroom Siege, this event is for you! Join us for this unique opportunity to connect with the developers, learn more about the game, and get a glimpse of the future of Shroom Siege. We can't wait to see you there!Read full article on Community Announcements (Upside Down Bird)
