Stack

Play free online — no downloads, no installs.

About Stack

Stack is a free online tower-building game you can play instantly in the browser. A block slides back and forth above the tower — drop it at the right moment to land it square, and build as high as you can. Simple one-tap play, no download and no sign-up, on phone or desktop.

How to play

Aim for a near-perfect overlap: a drop that lines up almost exactly loses no width, so the block stays wide and the game stays forgiving. Once a block narrows, slow down and focus on timing over speed — a thin tower punishes even small errors. Watch the block's edge rather than its centre, and release just before it reaches the same edge as the block below.

Frequently asked questions

Is Stack free to play?
Yes — Stack is completely free to play online in your browser, with no download, no installs and no sign-up.
How do you play Stack?
A block slides left and right above the top of your tower. Tap, click, or press space to drop it onto the block below. Any part that overhangs the block beneath is sliced off and falls away.
Can I play Stack on my phone?
Yes — Stack works on phones, tablets and computers. It runs in the browser, so there is nothing to install.
Any tips for Stack?
Aim for a near-perfect overlap: a drop that lines up almost exactly loses no width, so the block stays wide and the game stays forgiving. Once a block narrows, slow down and focus on timing over speed — a thin tower punishes even small errors. Watch the block's edge rather than its centre, and release just before it reaches the same edge as the block below.