Sky Stack
One block slides back and forth above the tower. One button drops it. That's the entire control scheme — everything else is about how precisely that drop lines up with the block underneath, because any overhang gets trimmed away, and a tower trimmed down too many times leaves almost nothing left to land on.
Dropping a block
- Tap, click, press Space, or press the down arrow to drop the sliding block.
- Lining it up exactly with the block below flashes ✨ PERFECT and keeps it at full width.
- Anything less than perfect trims the overhang off, narrowing the tower.
- Miss the stack entirely and the tower — and the round — ends.
The climb gets faster
Blocks slide quicker and the tower gets narrower to land on the higher you build, so the timing window that felt generous near the ground shrinks considerably by the time the sky has shifted from day to night to outer space — a visual marker of just how far up the tower has gone.
Frequently Asked Questions
Why does the tower get narrower as it gets taller?
Any overhang from a block that doesn't line up perfectly gets trimmed off, so the tower's width shrinks a little with every imperfect drop.
What does a PERFECT drop actually do?
It keeps that block at full width instead of trimming it — the only way to stop the tower from narrowing over time.
Why does the background change while playing?
Climbing high enough shifts the sky from day to night and eventually to outer space, a visual sense of how far the tower has gone.