Would you play the same 90-second math challenge as everyone else each day?

Hey Product Hunt!

I’m building Numday, a daily mental math challenge for Android.

The core idea is simple: everyone gets the same chain of 7 calculations each day, has 90 seconds to solve it, and then compares scores in global rankings or private leagues with friends.

We made one product decision early: you can play first without creating an account. Sign-up only appears after you see your score and want to publish it or enter the leaderboard.

I’d love feedback on the daily loop:

1. Does “same challenge for everyone” make the game more interesting?

2. Would private leagues with friends make you come back daily?

3. Is 90 seconds the right amount of tension, or too short?

Curious how you’d improve the habit loop before launch day.

Thanks!