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.
5 seconds to decide your fate
Your UFO dangles a possessed object from its tractor beam like a pendulum: it swings with real inertia, it resists, it has a will of its own. You have exactly 5 seconds before the auto-drop. Cut the beam at the perfect instant or let the game decide for you... and the game is never kind. Every drop is a gamble: fast scores points, risky scores more, and one mistake turns into an avalanche of possessed objects crashing down on your tower.The tower isn't nailed to the ground: move it
Object falling crooked? Did the pendulum leave you the piece at the worst possible angle? With A and D you shift the entire tower to adapt it to the falling trajectory and to everything happening on screen. Stacking here isn't just about dropping well: it's about catching well. A well-timed micro-adjustment saves the run; a panicked lurch buries it under its own weight.
The birds are coming for your tower... shoot first
Birds don't cross your flight path by accident: they're heading straight for your masterpiece. But your UFO isn't just a flying crane. Shoot them down mid-flight before impact and turn every wave into a shooting gallery where every bird you take down is a disaster you won't have to rebuild.
...or let them crash exactly where it suits you
Tower leaning dangerously to one side? A bird slamming into just the right spot is exactly the push you need. Allow controlled impacts in the zones where you need them and turn your enemies into unwitting bricklayers who straighten your tower. Knowing when to shoot and when to hold fire is a skill of its own... and the difference between chaos and a masterpiece.
And this is just the beginning of the chaos
A sarcastic goblin comments on your every move, celebrates your disasters and mocks your teetering towers: the voice that turns every failure into a laugh and the reason you try again just to shut him up. Over 400 possessed objects of cartoon horror, each with its own physics and its own character: learning to stack a trembling candelabrum won't prepare you for the bouncy coffin. 11 modes that completely reinvent the stacking challenge, 36 UFO skins, storms and meteors that hit right when you need to focus most. And Stream Rooms, where your viewers play against you in real time while you broadcast, with global leaderboards and daily challenges: every tower you build stops being just yours and becomes something the whole world can try to beat.
Get Stack Chaos: Alien Express now and find out how high you can stack before the chaos wins.Features
- Master the pendulum physics and decide in 5 seconds whether to play it safe or risk it all
- Move the tower with A and D to adapt it to every drop and everything happening on screen
- Shoot birds out of the sky... or let them hit exactly where you need to straighten your tower
- Discover over 400 possessed objects, each with its own physical personality
- Laugh (or suffer) with a goblin who comments on and mocks every tower you build
- Choose from 11 modes that completely reinvent the stacking challenge
- Compete live against your own viewers in Stream Rooms
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