Seven levels of mental rotation. Start with rotating 2D polygons, climb through composite letter-forms with mirror traps, then move to 3D — cube rotation, unfolded cube nets, and finally chiral polycubes (solids that look identical until you check which way they twist).
All seven levels are unlocked. Levels 1–5 train rotation on flat shapes; Level 6 unfolds cube nets; Level 7 picks out chiral polycubes.
