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A falling-block puzzle game with real quantum mechanics. Put pieces in superposition, entangle them across your tower, then observe and watch them collapse. Play solo, against a bot, with a friend on the couch, or online.
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Match strength key:80+65+50+<50Quantris
SteamAbout Quantris

Falling blocks that obey quantum mechanics
A Hadamard block puts the piece it touches into superposition: it might be there and it might not. Pieces that share a gate become entangled, so their fates are tied. Nothing is settled until you drop an observation block. Then every entangled piece collapses at once, and you find out which blocks were real.
A line clears only when every block in it has been measured and they all came out the same way: all there, or all gone. Plan for the collapse, or get buried by it.
The quantum state is simulated with the same math a quantum computer runs, so outcomes follow real quantum probabilities, not a coin flip dressed up. You don't need any physics to play. Each mode teaches its rules as you go.
Modes
Two players, one couch
Play co-op or head-to-head on one machine, with two controllers or a shared keyboard. In co-op, two towers share one team score and entanglement reaches across both boards. In head-to-head, entangle your pieces with your rival's, and your measurement can knock blocks out of their tower.
Online
The same co-op and head-to-head modes, against a friend by room code or anyone from the public room list.
Also
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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