Tower Stack
In Tower Stack you stack blocks as high as you can. Only the overlapping part survives each drop. Free, no install, no sign-up, works offline.
In Tower Stack, each block slides back and forth above the tower. Tap to drop it — only the part that overlaps the block below stays, so the tower narrows as it grows.
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Works offline after the first visit. No install, no sign-up.
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How to play Tower Stack
Tap to drop, and only the overlap stays
The moving block is cut down to the part that sits above the block below it. Everything hanging over the edge is removed and never comes back, so the tower can only get narrower, never wider.
Aiming is the whole game
The patch where the moving block overlaps the block below is shaded while you wait, so you can see exactly what will survive before you commit. Lining up the two edges is what keeps the tower wide.
A near-perfect drop keeps full width
If the block lands within about 3 pixels of the one below, nothing is cut off at all and you keep the width you had. A streak of those is shown while it lasts.
It speeds up as the tower grows
The sliding block moves faster with every layer, from a slow drift at the start to roughly three times that speed once the tower is tall. That, rather than the shrinking width, is what eventually ends a run.
Missing completely ends the round
No overlap at all ends the round immediately, and so does leaving a sliver too thin to stand on. Your score is the height you reached.
Tower Stack Tips and Strategy
Commit early, not late
The block moves faster every layer and the run ends the moment the overlap is too thin, so the mistake that finishes you is waiting for a perfect-looking alignment that never arrives. Drop while the overlap is still generous. A slightly off drop that keeps most of the width beats a late drop that keeps almost none.
Perfect drops are the only way back
Only a drop within about three pixels of the block below keeps the full width instead of cutting it, and the cut part never comes back. So a run of near misses narrows the tower permanently and there is no way to widen it again. When the tower is narrow, chase the perfect tolerance rather than the merely acceptable one.
Watch the overlap, not the edges
The shaded band shows exactly how much will survive before you commit, so aim at the shape of that band rather than at the moving block itself. Centring the block on the one below is not the same as centring what remains after the cut. Following the band keeps the tower wide instead of drifting narrower by degrees.
Tower Stack — Frequently Asked Questions
Can the tower get wider again?
No. Cut-off parts are removed for good, so the usable width only ever shrinks.
What counts as a perfect drop?
Landing within roughly 3 pixels of the block below, which keeps your full width instead of trimming it.
Why did my run end when the block was still moving?
Either it had no overlap with the block below, or the overlap was too thin to count as a layer. Both end the round immediately rather than leaving you to guess.
Does it need installing or an account?
No. It runs in the browser on a phone, tablet or computer and works offline after the first visit.