Epinephrine Physics Sandbox

Push. Launch. Watch them react.

Epinephrine Sandbox is a small experimental physics playground built around active ragdoll characters. Throw a crate at someone and watch them try to shield their head. Knock them off balance, test their reactions, or set up a chain of falling objects and replay the result in slow motion.

The grid floors, simple mannequins and development panels are part of the experience. You have access to the tools I use to experiment with the simulation.

Active ragdolls inspired by the style of NaturalMotion's Euphoria.

Characters try to brace for impacts, shield their heads, stumble and get back

on their feet. Build a situation, change the impact and watch how they respond.

These reactions are powered by the game's own Epinephrine system; Euphoria is

the inspiration for the style of movement.

In this first preview

• Three levels: Playground, Crate Yard and Ramp Lab.
• Spawn up to eight characters and experiment with physical props.
• Push, Shoot, Grab, Launcher and Shockwave tools.
• Characters that react to wounds, brace for incoming objects, protect themselves during falls and try to recover.
• Six prepared experiments to get started quickly.
• Slow motion, pause, camera shortcuts and instant level resets.
• Low, Medium and High graphics settings. High adds per-pixel lighting, adjustable sunlight and dynamic shadows.
• Local single-player play with keyboard and mouse. No account or internet connection needed to play.

Help shape the sandbox

This is an early playable preview. Buying the game supports continued development. Share clips of your experiments, report strange reactions and tell me which props, levels or character behaviours you would like to see next.

When reporting a bug, include the level, tool, graphics setting and what happened just before it. A short video and your PC specifications help me reproduce it.

The project is still evolving: occasional leg jitter, awkward poses and unstable reactions can happen, especially when several characters collide. There is no campaign, multiplayer or progression system in this preview. Custom experiments and physical reactions are the focus.

Getting started

Extract the entire ZIP into a writable folder and run PhysicsSandbox.exe. Keep assets.epak and the DLL files beside it. Open Experiments, choose a setup and press Enter to start. Use Backspace to prepare it again.

Use the Level selector to change maps. Press T for slow motion, Space to pause and F to frame the selected character. Hold the right mouse button to look around and use WASD to move the camera.

System requirements 

The minimum hardware has not yet been benchmarked. These are initial targets for Low quality with a small number of characters; they are not a guaranteed frame-rate specification.

Component	Initial target
OS	Windows 10 or Windows 11, with support for 32-bit desktop applications
Processor	Dual-core x86-compatible CPU; exact minimum model still to be tested
Memory	4 GB RAM target; minimum-memory testing pending
Graphics	Hardware OpenGL 2.1 compatibility support and an installed vendor graphics driver
Storage	100 MB free for the extracted preview and local settings/logs
Input	Keyboard and mouse

High quality additionally requires GLSL 1.20, depth framebuffer textures and shadow comparison filtering. Reduce quality and character count if performance drops. Integrated graphics and minimum-spec machines have not yet been validated.