Stacker is a one-button tower-building game. A block slides back and forth above your tower, and you tap the screen, click, or press the space bar to drop it. The part that lines up with the block below locks in; anything hanging over the edge is sliced off and tumbles away, so each layer you place is a little narrower unless you land it cleanly. Stack as high as you can before a drop misses.
It is a brilliant little exercise in timing, focus and steady nerves. The reward is immediate - a perfectly aligned drop flashes, grows your block back and keeps the streak alive, while the blocks speed up gently the higher you climb, so the challenge grows with you rather than punishing you.
Stacker was built by a UK SEND tutor with QTS. It is calm, ad-free and uses no third-party tracking, and it runs in any browser on a tablet, laptop or classroom whiteboard - well suited to 1:1 tutoring or screen-shared therapy sessions where a single, predictable button keeps things accessible. It is one of our free games, so there is no sign-up to play.
Tap, click, or press Space to drop the block. Line it up perfectly to keep the full width.
Start →Tap anywhere to drop. Space / Enter on keyboard.