Do math. There are three difficulties, which affect time given to answer each question and difficulty of each question. You keep going until you get one wrong answer. No workspace is provided. Either do it all mentally or have a piece of paper in handy.
The questions given are of simple mathematical operations (add, subtract, multiply, and divide) and geometrical problems. The third difficulty, however, has the use of factorial. WHEN DOING DIVISION, ROUND THE QUOTIENT TO THE NEAREST WHOLE NUMBER. Hey, everyone's unique. So don't blame me if the difficulty doesn't suit you.
