Mental math against the clock: a term appears, you type the result and confirm. The next problem follows right away.

Pick a type of arithmetic and one of the three game modes:

• Survival: No overall time limit, but every problem has its own countdown. A single mistake or an expired countdown ends the run immediately.
• 1 Min: One minute, as many problems as possible. Correct scores a point, wrong costs one.
• Tick Tack: You start with one minute. Every correct answer adds time, every wrong one subtracts time and the problem stays until you get it right. With each correct answer you gain a little less time and lose a little more.