Download Besiege for macOS

Over 300,000 player-built machines exist in the Steam Workshop alone. That's the kind of creative chaos Besiege drops you into — a physics sandbox where your only goal is to build something that can smash, fly, roll, or crawl its way through a medieval landscape.

Who will get completely lost in this game?

Anyone who ever sketched contraptions in a notebook. Besiege rewards tinkerers who enjoy the process more than the payoff — spending an hour perfecting a trebuchet's arm angle is the whole point. If you love games like Kerbal Space Program or Poly Bridge, this will feel like home.

What's the actual goal here?

You're given a series of levels — fortresses, villages, armed patrols — and an open-ended toolbox of wooden blocks, wheels, pistons, and flame throwers. How you conquer the objective is entirely up to you. A single level might be solved with a neat battering ram, a gangly walking spider, or a flying bomb that spins wildly out of control.

Bounced by the lack of a directed story

Players who want a directed campaign with a story, character progression, or clear right answers. Besiege doesn't hold your hand, and the joy is in trial-and-error problem solving. If fiddling with bracing and counterweights sounds like work, the initial delight can wear thin once machines start collapsing for no obvious reason.

Where does the longevity come from?

The level editor and deep Steam Workshop integration — you can download battle machines, new levels, and full texture packs. Multiplayer lets you pit your ridiculous creations against friends. The recent Mac support for The Broken Beyond expansion adds a new zone and a fuel pump block, giving veteran players fresh reasons to experiment.

Unlimited parts versus material budgets

Besiege's closest cousins both build things, but they build differently. Poly Bridge asks you to construct within tight material budgets — every beam costs something, and the engineering is precise, almost architectural. Besiege doesn't care about cost. It cares whether your spinning flail catapult can clear a hill without tearing itself apart first. The physics in Besiege feel looser and more destructive, which suits the medieval chaos perfectly.

TerraTech shares the vehicle-building DNA but pushes it toward exploration and resource gathering across open terrain. Besiege stays compact — each level is a contained puzzle diorama. Where TerraTech makes you roam, Besiege makes you obsess over one siege tower for two hours. If you've worn out the campaign in either of those games, Besiege scratches the ungoverned side of physics sandbox play that neither quite reaches.

Besiege, Shortcuts, and the Mac workflow

Besiege doesn't offer AppleScript hooks or Shortcuts integration — it's a game, not a productivity tool — but it sits comfortably alongside a few macOS features that make creative tinkering smoother. The Steam Workshop content you grab while playing lives in the same user Library folder as other Steam games, which means Time Machine automatically picks up your subscribed machines and custom levels without extra configuration.

For players who dip into modding, the level editor's XML-based save format opens cleanly in any text editor. I've used BBEdit to batch-adjust spawn coordinates across multiple custom levels, and the plain structure makes it straightforward. The game also respects macOS's native fullscreen and Mission Control gestures properly — swiping between Besiege and a reference image of a real medieval trebuchet in Preview feels like a natural part of the design loop, not a workaround.

Steam's cross-platform cloud saves sync your blueprints between a MacBook and a desktop Mac without friction, so the absurd walking fortress you prototype on the couch is ready when you sit down at a bigger screen later.

Version 1.91 brings a few long-awaited additions for Mac players:

• Mac support arrives for The Broken Beyond expansion.
• Explore the new Zone 79 with fresh challenges.
• A Fuel Pump block opens up new machine designs.
• Drag and reorder block category buttons to fit your workflow.

• Runs on both Intel and Apple Silicon Macs