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About
Numday is an Android mental math game built around a short daily challenge. Each player gets the same chain of 7 calculations and has 90 seconds to solve it, making scores directly comparable. The game focuses on speed, accuracy, and ranking, with mistakes adding a penalty and ties favoring the player who completed earlier. Players can try the challenge before creating an account, then sign in when they want to publish a score, appear in rankings, or keep playing after the guest limit. Numday also includes private leagues, where groups can share an invite code and compare results on the same daily challenge in a closed leaderboard. A separate practice mode lets players warm up with non-competitive chains without consuming the daily scored attempt.
Problem & solution
Problem
Players need quick mental math practice with fair, comparable scores.
Solution
Numday gives everyone the same timed 7-step challenge and ranks results.
Who it's for
Android users who like mental math and daily competition.
Main features
- 90-second challenge
- 7 calculations
- Global ranking
- Private leagues
- Practice mode
Use cases
- Play today's math challenge
- Compete in a private league
Comments
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- PabloJun 26, 2026
Hey NxGn Tools! Numday gives everyone the same 7-calculation chain each day. You have 90 seconds to solve it, then you can compare your result in the global ranking or in private leagues with friends. Give it a try! https://play.google.com/store/apps/details?id=com.kamisoft.numday