Watch one edge through the whole pass
In Rex Tower, press Build, then tap the play area or press Space to drop the sliding slab. The slab starts as wide as the floor beneath it. When one of their edges lines up, the opposite edges line up as well. Pick the left edge of both slabs or the right edge of both slabs, whichever you can see more clearly. Keep your eyes on those two edges until you drop.
Start watching when the slab is moving towards the tower. Notice how fast the gap between the edges closes. If it crosses the line before you act, let it come back. The slab continues sliding until you drop it, and the speed rises with the height of the tower. A hurried tap after a missed pass can cost more width than waiting for a second look.
Read the three possible landings
Imagine a top slab that is 60 units wide in the game. The moving slab has the same width. Compare its left edge with the left edge below. These are measurements in the game's own field, so you do not need to count pixels on your screen.
| Offset at the drop | What happens in the example |
|---|---|
| 3 units to either side | Perfect. The slab lines up with the tower and keeps its width, or grows if the streak qualifies. |
| 12 units to the right | Cut. The overlap is 48 units wide, and the rightmost 12 units break off. |
| 60 units to the right | Miss. The slabs just meet at their edges, with no overlap. The run ends. |
A perfect allows an offset of up to four units. If a cut lands to the right, the new floor starts farther to the right than the one below. On the next pass, aim for the edge of that new top floor. Using the original base as your reference can make you repeat the same error even when your timing feels right.
Recover a narrow tower one drop at a time
Suppose the 12-unit cut above leaves you with a width of 48. The cut scores one point and clears your perfect streak. The first perfect after it scores two points and leaves the width at 48. The second scores three points and still leaves it at 48. The third scores four points and widens the stack to 58. The ten-unit gain is limited by the width of the original base, so a stack that is already full width stays there.
Another perfect continues the streak and can restore more width. The bonus is capped at five points per drop, on top of the one point for placing the floor. If your next drop is a cut, the bonus streak starts over. Keep lining up the current top even when it changes shape. On a narrow tower it is worth securing a clean overlap when you are unsure, then building the streak on the next floor.
Practise a repeatable timing cue
Use the early floors to find a cue that works with your input. Look at the approaching edge and tap when it reaches the line you are watching. If the cut keeps falling on the side the slab was travelling towards, your drop was late. Try a slightly earlier tap on the next inward pass. If the cut keeps falling on the approach side, wait a little longer. This gives you a specific adjustment based on the last landing.
Each new slab can arrive from a different side, and the pace changes as you climb. Take a fresh look on every floor. A fixed rhythm can feel comfortable for a few drops, then break when a slab starts farther away. The visible gap is a better cue because it follows the current pass.
Open Rex Tower and spend one run watching the cut direction after each drop. In the next run, look for three clean landings together. The second exercise makes more sense once you can tell whether you were early or late.
