Tune the physics
Open the Physics panel and dial in gravity, beam stiffness, and break threshold. Toggle collisions on or off per layer. Turn on the debug overlay and watch the stress field while the structure deforms.
SANDBOX · PHYSICS
Physics Playground
Node beams, soft bodies, cloth, blasts.
A 2D sandbox where you build structures out of nodes, beams, and springs — then test them with forces, motors, and a generous supply of high explosives. There's no objective. Just see what happens.
Play Now
Opens the game · No install
14
Tools
9
Starter presets
∞
Scenes you can save
1
Share link per build
The Pitch
Place some nodes. Connect them with beams. Anchor a few to a static wall. Now you have a structure that has weight, holds load, and breaks when stressed past its limit. Add a thruster to push it. A motor to spin it. A bomb to take it apart. Watch everything react in real time.
This isn't a puzzle game. There's no win condition. It's an open-ended physics toy — closer to a screensaver you can poke at than a level you have to complete. Build a bridge, then put a car on it. Build a tower, then knock it down. Build a cloth, then watch the wind catch it.
Pause, slow, undo, redo. Tweak gravity. Tweak the beam break threshold. Toggle debug overlays to see the stress before it snaps. Save scenes. Save templates. Share with a link.
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Nodes, beams, springs, dampers
The four building blocks of every structure.
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Soft bodies & cloth
Drop a cloth preset and watch it drape over a structure.
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Tunable physics
Gravity, beam strength, break threshold, collision rules.
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Debug overlays
Live stress map, distance/angle/delta calipers, FPS and node counters.
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Scenes & templates
Save the whole canvas, or just the subgraph you'll reuse.
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Share by link
Export, import, or pop a URL into a friend's browser.
The Build Loop
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01
Place
Drop nodes onto the canvas. Each is a point with mass, position, and velocity.
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02
Connect
Link nodes with beams for rigidity. Springs for elasticity. Dampers for shock.
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03
Anchor
Pin to static walls or static nodes — otherwise the whole structure just falls.
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04
Energise
Add forces, thrusters, motors. Or skip ahead and lay charges.
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05
Watch
Press Play, see what breaks, hit Reset, change one thing, run it again.
The Toolbox
Fourteen tools in the left rail, grouped by what they do. Click one, click the canvas, watch it appear.
Build it
Node
A single point with mass. The atom of everything else.
Beam
Rigid link between two nodes. Snaps at the break threshold.
Spring
Elastic link. Oscillates around its rest length.
Damper
Absorbs energy. Kills oscillation in springy structures.
Anchor it
Wall
A solid surface. Things collide with it.
Static Wall
A wall that never moves. The ground, basically.
Static Node
A pinned node. Structures hang off it.
Caliper
Measure distance, angle, delta — live, while the sim runs.
Move it & break it
Force
A vector. Set magnitude and angle, attach to a node, push.
Thruster
Directional push that fires when the sim starts.
Motor
Applies torque around a hinge node. Wheels, fans, anything that spins.
Bomb
Radial blast. Detonate manually or on a timer.
Static C4
A placed charge. Sticks to a node, waits for the Detonate button.
Detonate
The big red button. Fires every charge you've placed.
Don't Start From Scratch
Nine ready-made presets in the right rail. Click one, click where it should go on the canvas, ready to abuse.
- Box
- Bridge
- Rope
- Cloth
- Ball
- Car
- Tower
- Wall
- Rig
Stack them. The screenshot up top is a Bridge with three more presets dropped on it for good measure.
Tune, Save, Share
Save the build
Name the canvas, hit Save. Whole-scene snapshots live in browser storage. Save a few alternatives, switch between them. Or save a sub-structure as a template — build a wheel once, paste it into a dozen cars.
Share by link
The Share button emits a URL that loads your scene in someone else's browser — no account, no upload, just a deep-link with the scene encoded into it.
Export & import
Want it on disk? Export the scene as a file, drop it back in later. Same for templates. Versioned by you, however you like.