Games like Besiege on Steam
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GearBlocks
Explore a world of creative building, interactive machines, and gears - lots of gears. Build all things mechanical: cars, trucks, cranes, tanks, gearboxes, engines, clocks, anything you can think of. Test your creations to destruction in challenging scenarios, and share them in the workshop!
ACTION SANDBOX
A physics sandbox game for people who like to play with digital toys. Create, control toys and define your goals.
The Powder Toy
The Powder Toy is a classic physics sandbox game, which simulates air pressure and velocity, heat, gravity and a countless number of interactions between different substances
Brick Rigs
Build your own vehicles or download one of the more than 200,000 creations already uploaded to the Workshop and experience the dynamic driving and destruction physics of Brick Rigs!
Ultimate Ragdoll Game
Ultimate Ragdoll Game is a Sandbox game without any limits. Have fun with ragdolls available in Steam Workshop and build your very own constructions using wide variety of blocks.
Sinking Simulator
The sequel to the unfinished Sinking Simulator, now with a lot more POWER!!!! Witness your witty love of chaos and destruction sinking 2D ships and everything else on board!
Demolish & Build 2017
Become a boss of Demolition & Build company. Destroy small wooden huts and huge concrete buildings. Manage your workers. Invest earned cash in your own land properties and rent them for profit in open sandbox world. Use various hand tools, buy new machines and customize their parts.
SimpleRockets
I am excited to release my first game on Steam! SimpleRockets was released in 2013 for mobile and I've put a ton of work into it to get it ready for PC and Mac. It was inspired by KSP, and it offers a simpler 2D experience for building rockets and exploring space with realistic orbital mechanics.
Garry's Mod
Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.
Disassembly 3D
Disassembly and destruction physics sandbox simulator. Detailed models of objects and vehicles and their internal parts. Disassemble objects successfully to unlock weapons mode and destruction. Fight evil mannequins with everything you got in physical combat!
Demolish & Build 2018
Your company is going global. Use big machines to demolish huge buildings or go close and personal and use your hammer. Buy land properties, upgrade your machines and hire workers in different parts of the world.
Crazy Machines 3
Crazy Machines 3 is the latest, greatest, most amazing and craziest part of the series and fascinates once more with physic-based puzzles. Build your own crazy machines and share your awesomeness across the world thanks to the Steam® Workshop.
Poly Bridge
Unleash your engineering creativity with an engaging and fresh bridge-building simulator with all the bells and whistles. Enjoy hours of physics-based puzzle solving in the Campaign and then jump in the Sandbox to create your own bridge designs and puzzles!
BeamNG.drive
A dynamic soft-body physics vehicle simulator capable of doing just about anything.
Universe Sandbox
Create & destroy on an unimaginable scale with a realistic physics-based space simulator. Explore the beauty of our universe and the fragility of our planet. Use science to bend the laws of gravity, collide planets, boil away oceans, fire epic space lasers, and customize your universe.
Kerbal Space Program
In Kerbal Space Program, take charge of the space program for the alien race known as the Kerbals. You have access to an array of parts to assemble fully-functional spacecraft that flies (or doesn’t) based on realistic aerodynamic and orbital physics.
Poly Bridge 2
The acclaimed bridge-building indie-hit is back! More levels, more features, more physics fun!
Fun with Ragdolls: The Game
Become a ragdoll and create your own environments in Sandbox Mode, explore worlds created by others, or just flop around your destructible sets! Fun with Ragdolls®: The Game lets you enjoy everything you love about ragdolls!
Demolition Company Gold Edition
Demolition Company Gold Edition: the complete Demolition Company experience! Includes Demolition Company, the DLC Kit Pack PLUS brand new equipment, new missions and a HUGE new city district 4 times bigger than the old Demolition Company districts!
Landlord's Super
Your quintessential construction simulator is here. Take a dodgy loan, restore a property, move in the locals, attend to their grievances, then celebrate with a pint in this fully-simulated, open-world 1980's Britain.
People Playground
Shoot, stab, burn, poison, tear, vaporise, or crush ragdolls in a large open space.
Turbo Dismount™
Turbo Dismount is a kinetic tragedy about Mr. Dismount and the cars who love him. It is the official sequel to the wildly popular and immensely successful personal impact simulator - Stair Dismount.
The Enjenir: The Engineering Physics Building Simulator
Put your engineering and problem solving skills to the test in this sandbox physics building game! Enjoy the freedom of completely gridless 3D sandbox building combined with hilarious ragdoll third person controls, offering a truly unique and hilarious "Enjeniring" experience!
Teardown
Prepare the perfect heist in a fully destructible, simulated voxel world. Tear down walls with vehicles or use explosives to create your own shortcuts. Shape the environment to your advantage in the most creative ways you can imagine. Play solo or with up to 12 players in multiplayer.
Hardspace: Shipbreaker
Equipped with cutting-edge salvaging tech, carve & slice spaceships to recover valuable materials. Upgrade your gear to take on more lucrative contracts and pay your billion credits debt to LYNX Corp!
When Ski Lifts Go Wrong
Ride into a hilarious construction puzzler; packed with over 100 creative physics-based challenges, sports and bloody disasters! Build contraptions to help every passenger reach their destination. Enjoy the sports by controlling your riders away from (or towards if you feel like it) peril!
Wooden Battles
Build a wooden fort, place your units, watch the mayhem!
Backrooms Break
Explore and break the environments of the Backrooms and Poolrooms! Utilize Thor's demolition hammer, firearms, and explosives to carve your way through the walls and entities. This isn't just another mundane walking simulator game. Now the entities are the victims. Overcome your fears with violence.
Space Engineers
Space Engineers is a sandbox engineering game where you design and build ships, stations, and planetary bases in a fully destructible environment. Explore planets and space, mine resources, survive hazards, and engage in combat alone or with friends in Creative or Survival modes.
Monuments Renovator
Monuments Renovator is a game in which you play the role of a professional monument renovator. You choose from among the world's greatest monuments, restore them to their former glory and learn about history and architecture.
Forts
Unleash your creativity and strategic prowess in Forts, the exhilarating physics-based RTS! Design, construct, and customize imposing fortresses, bristling with devastating firepower, and blast your opponent’s buildings to rubble!
Deconstruction Simulator
Deconstruction Simulator is the ultimate demolition simulator, offering you complete freedom of action and a wide array of contracts to complete. Get ready for spectacular destruction.
Bridge Constructor Portal
Enter the Aperture Science Enrichment Center and experience Bridge Constructor Portal – the unique merging of the classic Portal™ and Bridge Constructor™ games.
Bridge Constructor: The Walking Dead
Bridge Constructor: The Walking Dead combines the legendary and challenging puzzle gameplay of Bridge Constructor™ with the post-apocalyptic zombie universe of AMC’s The Walking Dead.