What this mental rotation game trains
Rotate Shapes trains the part of spatial reasoning that asks whether two 3-D objects are the same under rotation. The app pushes that skill with dense polycube shapes, mirror traps, and timed decisions so you have to compare structure, not just silhouette.
Why there are two play modes
Exact-match mode is closer to a classic mental rotation test: you see a target and pick the identical object from several options. Rotation-cue mode is more explicit. It tells you the degree of the turn and asks you to predict the landing orientation.
Where to start
New players usually do best with 4 or 6 cubes, 4 choices, and a 30 second timer. If you want to study first, the rotation lab lets you watch one shape turn until the structure settles in.