Use the tower edge as a guide
Compare the sliding slab’s near edge with the tower’s matching edge. When the edges line up and a broad overlap is visible, tap. Trying to center only by the slab’s midpoint can be difficult if the camera angle or movement distracts you, so use one stable corner or edge as your reference.
Adjust after an imperfect landing
The overhang is removed, so the tower’s top may be narrower or shifted after a miss. Recheck the new outline before placing the next slab; do not keep aiming at the width you remember from earlier in the run. If the remaining surface is small, wait for a clear overlap instead of treating the previous rhythm as a fixed metronome.
Aim for repeatability
A useful practice target is several centered landings in a row rather than a single tall result. Notice whether your misses happen because you tap early, late or misread the overlap. Change one cue on the next attempt. The mechanic description supports these placement tips; it does not promise that every screen or device will render timing identically.
Questions about Stack Tower tips
Does an overhang stay on the tower?
No. Any overhang is sliced off after the slab lands, leaving a smaller top for the next placement.
What should I focus on while the slab moves?
Watch its overlap with the existing tower and tap when the placement looks centered. Then inspect the new top because an imperfect landing changes the next target.