A physics co-op sandbox for up to four people. You pick up rubber ducks and throw them into a thirty-two-sided pit that has no bottom, and every duck pays. The money buys machines, walls, tunnels and fans, and the arc of a session is the trip from carrying ducks by hand to watching a factory do it without you.

It looks like a PlayStation game on purpose: flat-shaded low-poly geometry rendered into a small buffer and scaled back up, grey concrete with yellow floor markings, and a black hole in the sky whose shader is lifted straight out of Gargantua.

Nothing saves. A session runs two to four hours and starts from nothing the next time, which is the point, the fun is in rebuilding the line better, not in inheriting it.