Despite the numbers below, I actually gave up at 62 questions not just because I saw so many decimals, but because I started remembering brutal things about school. I felt really awful about myself and no longer could allocate enough energy for mathematics. I didn't really push my "muscles" to the edge of failure. Nonetheless, I managed to find a good mental technique to improve arithmetical mathematics.
Difficulty: 1
Pure run
Numpad: Yes
Gamemode: Classic
