Besiege is a physics based building game in which you construct medieval siege engines and lay waste to immense fortresses and peaceful hamlets. Build a machine which can crush windmills, wipe out battalions of brave soldiers and transport valuable resources, defending your creation against cannons, archers and whatever else the...
Recent Reviews:
Very Positive (108) - 89% of the 108 user reviews in the last 30 days are positive.
All Reviews:
Very Positive (25,227) - 94% of the 25,227 user reviews for this game are positive.
Release Date:
Jan 28, 2015

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Early Access essentially puts us in dialogue with the community and the players. We want Besiege to be easy to access, and we would like to involve and address player feedback as the game progresses. Also, we really love to see how far everyone can push the building mechanics, and we want to be able to respond to the crazy methods people are discovering that we weren't even aware of!”

Approximately how long will this game be in Early Access?

“We aren't entirely sure how long it will take to release the game, our initial estimate put the release between 1.5 and 2 years but due to the success of Besiege we’ve been able to greatly expand the scope of the game with far more ambitious features than were initially possible. We are currently two years in and we’re estimating another year of development until release.”

How is the full version planned to differ from the Early Access version?

“The full version will contain more levels, in a variety of environments, as well as more blocks, building tools and other larger scale features that we’re not quite ready to talk about just yet!”

What is the current state of the Early Access version?

“The Early Access version contains 38 levels, comprising the kingdoms of Ipsilon, Tolbrynd & Valfross. There are three sand-box levels to test creations and in any given level you can disable all limitations, allowing for experimentation. There is also a time-dilation dial, allowing the game to be viewed in slowmotion, or at 2X the normal speed. The game contains a broad suite of building tools and pieces, including flying pieces, flamethrowers, cannons, contractible springs, axles, detachable joints, explosives and much more. You can also save and load machines in any given level, as well as share them online via the Steam Workshop.”

Will the game be priced differently during and after Early Access?

“We are going to scale the price with the amount of content available. So as more features, game modes and levels are added we will add to the cost incrementally. We hope that players will feel they paid the appropriate price for the amount of content available at any given stage of the games development.”

How are you planning on involving the Community in your development process?

“We are already being surprised by what people are constructing and discovering. It is quite amazing, and we want to expand and address features that the community finds or wants. For example, some members of the community are building an immense Siege Walker type thing – we never even realised this was possible. We want to facilitate such creativity, so we will be constantly looking toward what everyone is doing!”
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Recent updates View all (49)

July 29

Cloud Save & Bug Fixes

Hello Everyone!

We hope you’re all having a good week! Today we’ve got another small update for you V0.85-10458!

Version 0.86 adds cloud saving support to Steam (Another popular requested feature) so you’ll never again lose your war machines or level progress if you change computer or take a break from Besiege. Bundled with the cloud saving we’ve also got a whole bunch more bug fixes for you.

Once again we’d like to remind everyone that the new update will disable mods to prevent compatibility errors and if you come across any bugs while playing, we’d greatly appreciate it if you could take the time to report them on our forums or the Steam forums.

We hope you find this update helpful!

Von & The Team

Changelog Version 0.85-10458:


- Implemented automatic cloud saving for machines, levels and progress
- When middle clicking on a picked object in the logic editor, it will focus on it
- Added an option for disabling the focus effect


- Completely removed GameAnalytics
- Ripple now moves with the focused object


- Fixed a problem with level editor/AB gizmos glitching when the camera was too far away
- Explosions no longer unconstrain movement on certain objects
- Fixed respawn zone picker behaviour
- Cannonball is now returned to the projectile pool with the right scale
- Build zone highlights properly when selected out of sim
- Chat and invite button no longer disappear in sim
- Focus effect is now time scale independent
- Resolved SP Ipsilon archer pooling issues
- Fixed vacuuming causing issues on Pertinent Tower
- DeselectAll and RemoveObjects now processes the selection in the right order, so it retains the last selected block when undoing
- Fixed a problem where the rope would inflict machine damage when exiting sim
- Removed positional threshold for spring/rope since it had a few drawbacks
- Simplified spring/rope cylinder math
- Fixed a problem where trying to update an existing machine would result in an empty screen
- Cleaned up timestamp code for sorting
- Freezing Frontier only triggers in campaign mode or for the local machine
- Fixed not being able to place blocks after refocusing on the client
- Fixed deselect undo not being created when removing blocks
- Improved middleclick focus algorithm
- Moved fire overlap code to physics update
- Fixed a problem where deselection of level objects wouldn't remove gizmo
- Reintroduced a lost spacing of loading a machine to mimic the timing of before but making it elapse slightly more time


- Fixed modded blocks not having a BlockDamageType when necessary
- Fixed UndoActionScale not taking a previous position
- Fixed and generated modding documentation
18 comments Read more

July 9

Small Bug Fix Update

Hello Everyone!

Today we've got another small bug fix update for you, you can read the changelog below.

As always if you encounter any issues please try the usual; verifying of the game cache, disabling mods and if that doesn't work please report the issue on the Steam forums so we can take a look at it!

I'd also like to just thank everyone for their feedback after yesterdays update, we really appreciate it!




- Machines in ghost mode cannot collide with other objects anymore
- Duplicate blocks button in AB is now also available when level is simulating
- No longer tries to access NAT helper when shutting down a LAN server/client
- Fixed various issues with the achievements not being setup correctly
- Multiversal Challenge no longer requires playlist mode to unlock
- Fixed error when trying to access an achievement that doesn't exist
- Archer AI no longer tries to force AI to update at the wrong time scale
- Fixed floating geometry in Marksman's Pass
- Fixed broken Ipsilon tent interpolation
- Fixed fleeing pose for Ipsilon Archer
- Moved mountains in Barren Expanse to Floor layer
- Resolved inconsistencies in AI blood decal scaling
- Resolved FireTag/Controller, childBodies and outline/highlighting issues on modded entity prefab
- Short log/wooden pole mesh wouldn't return to default mesh when it doesn't have a custom skin
- Reenter camera block after respawning
21 comments Read more
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About This Game

Besiege is a physics based building game in which you construct medieval siege engines and lay waste to immense fortresses and peaceful hamlets. Build a machine which can crush windmills, wipe out battalions of brave soldiers and transport valuable resources, defending your creation against cannons, archers and whatever else the desperate enemies have at their disposal. Create a trundling behemoth, or take clumsily to the skies, and cause carnage in fully destructible environments. Ultimately, you must conquer every Kingdom by crippling their castles and killing their men and livestock, in as creative or clinical a manner as possible!

System Requirements

Mac OS X
SteamOS + Linux
    • OS: Windows XP (latest SP)
    • Processor: 2.2Ghz Dual Core
    • Memory: 2 GB RAM
    • Graphics: 512mb Dedicated VRAM
    • DirectX: Version 9.0c
    • Storage: 1 GB available space
    • OS: OSX 10+
    • Processor: 2.2Ghz Dual Core
    • Memory: 2 GB RAM
    • Graphics: OpenGL 2.0 compatible, 512 MB VRAM
    • Storage: 1 GB available space
    • OS: Ubuntu 12.04 or higher
    • Processor: 2.2Ghz Dual Core
    • Memory: 2 GB RAM
    • Graphics: OpenGL 2.0 compatible, 512 MB VRAM
    • Storage: 1 GB available space
    • Sound Card: ALSA compatible

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