Move the stack. Never a big disc onto a small one.

The only arena here that rewards sitting still. Fewer moves wins — speed barely counts, and undoing costs double. Past Lv 12 the target stops being a neat stack and becomes a shape.

Your first build finds your level. Towers grow one disc at a time, and three discs is always solvable — you can't fail a calibration.

🔓 Next unlock at Lv 12: Set piece — The target stops being a neat stack and becomes a shape (Tower of London)