[1.] Guess the sizes of five angles in a row. The angle you need to guess is marked with a red circle in the picture.

[2.] The total allowed error for the five angles is 30°, meaning an average of 6° for each guess. However, you may be off by more than 6° on an individual angle; what matters is only that you do not exceed the total allowed error of 30°.

[3.] If you exceed the total allowed error of 30°, the game is over.