Physics is the comedy writer
Every correction travels through the whole crew.
Leads stretch, bodies ragdoll, props become anchors, and one sensible pull can turn four other sensible pulls into municipal paperwork.
Playtest build 1.0.0
Steam relay ready
Four friends. One giant pet.
Everybody pulled the wrong way.
2–6 online co-op
20–45 minute walks
100% physical bad ideas
BIG ANIMAL UNIT
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BEDTIME IS APPROACHING
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DO NOT CROSS THE LEADS
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VOICE REMAINS LIVE
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Municipal work order 08-31
Get Bean home.
Keep your friends attached.
Every handler controls an independent physics lead. Pull, give slack, brace, carry obstructions, and drag flattened coworkers back into the fight while one affectionate eight-meter juvenile follows the worst possible smell.
CREW LINK
4 / 4
ACTIVE TEMPTATION
FORBIDDEN SNACK
Proximity voice
Warnings get quieter around the wrong side of Bean.
Distance and the city muffle the crew. Hear panic approaching, lose a friend behind the pet, then argue face-to-face at the next corral.
Failure becomes evidence
The incident report knows who started it.
Every leg ends with a decisive freeze-frame and blame cards for flattened workers, dropped handles, critical loads, and unlikely saves.
Official field footage · 00:47
A routine walk.
According to the paperwork.
Captured from real multiplayer bot sessions over the same host-authoritative netcode used by the playtest build.
Real in-engine footage. No concept render. No generated imagery.
The walk gets worse on schedule
Three districts.
Less daylight.
More opinions.
Park Market
Room to learn. Too many snacks.
Civic Center
Narrow crossings. Loose cargo. Rising wind.
Home Quarter
Storm light. Bedtime. No clean route left.
Filed without admitting fault
Incident reports
Eight real 1920×1080 frames from the current release candidate.
Big Animal Unit · Recruitment desk
Bring your friends.
Steam handles the distance.
Download the same 1.0.0 playtest candidate on every machine. Keep Steam open, host a friends walk, send the invite, and click Join. No IP addresses, port forwarding, VPNs, or router setup.
Recommended for this device
WIN
Primary playtest build
Windows x64
- Windows 10 or 11, 64-bit
- Keyboard + mouse
- Steam client and microphone recommended
SHA-256 da0cc8a7…87025
Recommended for this device
MAC
Universal convenience build
macOS
- Intel + Apple silicon
- macOS 11 or newer
- Ad-hoc signed; not Apple-notarized
SHA-256 5a9a5522…65137
Invite to disaster in under 60 seconds
How to start the first walk
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1
Extract everything
Do not launch from inside the ZIP. Keep the app and its companion files together.
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2
Open Steam first
Every tester signs into their own Steam account. Close any other Spacewar/App 480 session.
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3
Host a Steam walk
Select HOST A STEAM WALK, then INVITE STEAM FRIENDS in the overlay.
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4
Accept and click Join
The guest enters the same lobby through Steam relay. A short crew code is the fallback.
Read before the first cross-household test +
This candidate uses Valve’s public Spacewar development App ID 480. Steam initialization, lobby lifecycle, invite UI, and the complete multiplayer flow have execution evidence locally. The first two-account, two-household Steam session is deliberately still a human playtest—not a claim this page pretends has already happened.
On macOS, the build is ad-hoc signed but not notarized. If Gatekeeper blocks the first launch, Control-click LEASH REACTION.app, choose Open, then confirm Open. On Windows, extract the entire folder before launching LEASH REACTION.exe.
Bedtime cannot be extended
Everybody grab a lead.
One finished mode. Three escalating districts. No accounts, telemetry, microtransactions, or waiting room for flattened friends.
Join the playtest