Stage 2 of GEOMGBITS: seven trials in the polygon laws. Exterior angles always spend one full turn, so 360 ÷ n beats the textbook formula every time — and run the same division backwards and a single angle tells you how many sides the shape has.
Each trial is locked until you clear the one before it. Every level scores out of 1000 — 600 for accuracy, 400 for speed — so speed alone can't clear the bar; you have to solve most problems, and quickly. Reach 650 to unlock the next.
You can get any regular polygon's angles from 360 ÷ n, run that backwards to name a shape from one corner, and spend the (n − 2) × 180 budget to recover a missing angle in any polygon at all.