Lefty
The anchor
Heavy. Grips bollards, ground-pounds through cracked floors, launches his partner, and outlasts the cold. He resists forces.
About Sackbound
Two nuts. One sack. Heat stretches it, cold shrinks it — and every double jump twists it tighter.
Lefty and Righty share one stretchy sack, and it will not let them go. Heat lets them spread out. Cold pulls them together. And every mid-air flip winds a twist into the sack that chokes the leash a little tighter — until they’re stuck nose to nose with twelve seconds to untangle.
Ten levels of geysers, glaciers, saunas, and one very large Nutcracker.
The mechanics
Every verb in the game is built from one connection between two players.
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Thermal tether
Heat lengthens the sack, cold shortens it. The sack lags behind the room, so sprinting through a cold corridor before you shrink is real play.
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The twist
Every double jump winds in a half-twist. One costs 15% of your reach, two costs 35%, three is torqued — twelve seconds to fix it or restart. Twists are signed, so partners flipping opposite ways cancel out.
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Torque launch
At exactly two twists the sack is a loaded spring. Release it and you’re slingshotted, distance scaling with how hot you are. The punishment is also the traversal.
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The roll
Both players running the same way turns the sack into a rolling ball. Friction heats it as it goes, which makes rolling the game’s portable heater.
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Anchoring and swinging
One player grips a post and becomes immovable; the other swings on the tether like a pendulum, pumping at the top of the arc. The level decides who anchors.
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The yank save
When something grabs your partner, you anchor and snap the tether, timed to the enemy’s shake. The best co-op moment in the game.
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The snowball
Below −25°C the sack shrinks so far that you merge into one ball and your inputs literally sum. Push opposite ways and it spins, which adds twist.
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Overheat
Twenty seconds above +40°C and the sack goes slack for five. The tether switches off, you flop independently, then it snaps back. Heat is powerful but rented.
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Half-taut
Straddle a hot/cold boundary and each half gets its own length. One player has a short stiff leash and better balance; the other has slack and more swing.
The two of you
Righty
The jumper
Light and fast. Jumps higher, wedges into slots too tight for Lefty, and works switches with nimbler hands. He escapes forces.
FAQ
- Can I play it on my own?
- It’s built for two on one couch. A solo mode is included for the friendless.
- Is there online co-op?
- Not at launch. Local co-op, with Steam Remote Play Together as the way to play with someone elsewhere.
- What will it look like?
- Like the art on this site — stylized 3D, chunky and cartoon, lit warm against cold. The sack is a translucent membrane you can see both nuts through, and it stretches, wrinkles and twists in real time.
- Is it hard?
- It’s hard. That’s the point. Assist options are included, no judgment.
- What platforms?
- PC first, on Steam. It’s built in TypeScript and Three.js, so a browser build is nearly free after that.
- When can I play it?
- No date yet. A prototype proved the mechanics work and the 3D build is underway. The mailing list is how you’ll hear about it.