About Stack It
Stack It is a free, instant browser game — no download, no account, no app store. Each container slides back and forth above your stack; drop it when it lines up with the layer below. Whatever hangs off the edge falls away, and your next container inherits the new, narrower width. Line up a run of perfect drops in a row and the container keeps its full width instead of shrinking.
The crane speeds up gradually as your stack grows, so precision gets harder to hold onto the higher you go — not unlike keeping a real container yard organized during a busy shift.