- Hold and drag the figure to turn it right round — 360 degrees, and past, never sticking
- Dragging turns the CAMERA, not the figure — and the options cannot be turned, so it is still mental rotation
- Arrow keys turn it too, for anyone who cannot hold and drag
- It never zooms as it turns — the coordinate box is the same at every angle
- The Shepard–Metzler figures, as the textbooks pose them
- Compared by canonical form over all 24 rotations of a cube
- No two options are ever the same figure, so the board cannot be solved by elimination (npm run verify:rotation)
- A wrong pick explains itself: a mirror, or a figure bent differently
- 'Turn it for me' really does turn the figure, one step at a time
- EQ: three misses in a row buys a breath, then the turning aid opens itself
- Drag to turn the figure freely with a fingerplanned
✓ = done · ☐ = planned. Every game is built one step at a time like this.