NNumter
Live mathematics competition

Same problem.
Same clock.

Automatic public matchmaking is rated for account players. Daily Duel, bots, private challenges, rematches, and series are clearly separated as unrated play.

Start Quick Match →
Before you play

Know what changes your rating.

Rated automatic play

Quick Match and account public/custom matchmaking update the permanent Duel record after authoritative settlement.

Unrated selected play

Daily Duel, bots, private/direct challenges, rematches, and Best-of series never change rating.

Events disclose the rule

Official continuous Arenas are unrated. Operator-created private events show their rated or unrated setting before entry.

Daily standardized competition

One shared set every UTC day.

Verified accounts receive one fair, unrated attempt: 10 identical server-owned problems, 120 seconds, and no Plus advantage.

Create an account to enter →
Competition lobby

Choose how you want to compete.

Account automatic matchmaking is rated. Guest arenas and account-only private challenges are unrated.

Live competition
Q
Recommended

Quick Match

One click finds the closest fair opponent, then widens carefully if the queue is quiet. The match uses 10 problems, 20 seconds each, and a shared skill-appropriate division.

10 problems20s clockAccount required
Create an account →
Always available · never a human

Practice a Numter Bot

A clearly labeled server-controlled opponent. Bot matches are always unrated and excluded from human competitive statistics and leaderboards.

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GGuest playerUnrated · wins and losses are not savedCreate an account
Used only for this match. No profile or record will be created.
1Choose an arenaPlayers in the same arena are paired automatically.
2Time per problemRandom accepts any available allowed clock.
3Match lengthRandom accepts any available format.
+Arithmetic arena5 problems · 20 seconds each · unrated guest match