How to play

1. Pick a subject On the home page, tap Physics or Math. There is one new problem in each, every day.
2. A clock starts As soon as the problem opens, a timer counts up. You can leave and come back. The timer keeps running.
3. Type your answer There are no choices to tap. Work it out on paper, then type your answer in the box.
4. Check the preview Under the box we show how we read your answer. If it looks right, tap Submit. You only get one try.
5. See your score You see your points and the full solution. Tap Share to show friends, with no spoilers.

How scores work