About Stack Up
Stack Up is a one-touch tower builder about timing rather than speed. A block slides back and forth above the tower; tap to drop it. Land it squarely and the tower grows, land it slightly off and the overhang is shaved away, miss entirely and the run is over. Every clean drop makes the next block narrower, faster and further off-centre.
Perfect landings chain into a combo with a glowing seam, and your best score is kept in this browser, so there is always a number to beat. One thumb, one rule, and the usual just-one-more-try problem. The whole game is a single canvas with no loading screen and no timers to wait through.
How to play
- Watch the block slide and tap (or press Space) when it lines up with the tower.
- A centred drop keeps the full width; an off-centre drop trims the overhanging edge.
- Chain clean drops into a combo before the blocks get too narrow to work with.
- One complete miss ends the run — try to beat your best score.
Tips & tricks
- Find the rhythm of the slide instead of staring at the edge of the block.
- A small trim is survivable; greedily chasing a perfect drop usually costs more than it earns.
- Your best score is saved locally in this browser and shown on the game over screen.
Scoring & progression
- Each block that lands on the tower adds to your score; a perfect, squarely centred landing maintains a combo and lights the seam between blocks.
- An off-centre landing still scores but trims the overhang, so the next block starts from a narrower platform — the penalty is structural rather than a points deduction.
- There is no time bonus and no multiplier you can buy. Score is a count of surviving drops plus the combo state you held while making them.
- The best score, current score and finished-run result are stored locally and reported to the portal for XP, badges and the daily challenge.
Stages & bosses
- Opening drops — wide blocks on a slow slide, where a centred landing is easy.
- Narrowing phase — each clean drop reduces the width available for the next block.
- Speed phase — the slide gets faster and starts further off-centre as the tower climbs.
- Endless tower — there is no final stage, boss or level cap; the run ends only when a block misses completely.
Frequently asked questions
Is there an end to Stack Up?
No. The tower keeps growing until a block misses the one below it. Each clean drop makes the next block narrower and faster.
Is my high score saved?
Yes, your best score is stored in this browser. Clearing browser data or switching devices will reset it.
Can I play with one hand on a phone?
Yes. The whole game is a single tap, designed for one thumb — there is no dragging or aiming.
Version history
- November 13, 2026 — Guide expanded with the trim penalty, combo scoring and the endless difficulty curve. No gameplay change.
- Current build — One-tap input, combo seam, progressive narrowing and speed, local best score, portal result reporting.
Play tips
Stay safe out there — no games while driving or crossing the street.
Mobile stuck on the PC version? In Chrome: ⋮ menu → uncheck "Desktop site" → refresh.
For best compatibility, use Chrome or Edge.
No full-screen, no sound, or a Unity not supported message? Use a tablet or PC.
Frozen, blank, or unresponsive? Refresh or reopen your browser; still stuck, try another game.
Right-click problems on Edge? Turn off "Enable mouse gestures" at edge://settings/mouseGesture.