Stack Chaos: Alien Express screenshot 1
STREAM ROOM - Gameplay with 20 players
Stack Chaos: Alien Express - Official Trailer
PHYSICS TEST
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Apr 13, 2026·Vorago Studios·
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A physics-based arcade game where you pilot a UFO dropping possessed horror objects to build impossible towers. Swing the pendulum, time the drop, pray it doesn't collapse. 400+ objects, 11 game modes, and a sarcastic goblin that roasts your every move.

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About Stack Chaos: Alien Express

Welcome to Alien Express™ — the galaxy's worst delivery company.

You're an alien delivery driver with a tractor beam, a swinging pendulum, and exactly 5 seconds per package. Where it lands, it stays. Build the tallest tower of possessed cartoon horror objects... or watch it all come crashing down. We drop, you pray.

The Game

Your UFO swings cargo like a pendulum. Move left, move right — the package follows with momentum and inertia. Cut the beam at the perfect moment, or the auto-drop kicks in after 5 seconds. Drop fast = more points. Drop risky = even more points. Drop wrong = total chaos.

What's Inside

400+ possessed objects with unique physics and personality
11 game modes — from classic stacking to inverted pyramids
36 UFO skins
A sarcastic goblin that roasts your every move
Global leaderboards and daily challenges
Stream Rooms — your viewers compete against you live
Atmospheric chaos: meteorites, storms, birds
12 languages, Steam Achievements, Cloud Save

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.

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