Mental math game for speed and accuracy.

Practice on the go and get faster every day with quick rounds, times tables, division, subtraction, and more.

High Score 0

Score 0

Time Time Remaining 0s

Ready?

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How to play

Choose how you want to play, answer the math questions, and try to beat your own best score. SumNinja saves progress for each player.

Look at the question in the middle of the screen.
Type the answer and press Enter. In Speed, each question has its own timer. In Accuracy, the first wrong digit ends the round.
After each round, SumNinja updates your stats and chooses questions that fit your level.

Play together

Players

Add a player for each person. A player has a name, emoji, color, settings, stats, and history.

Multiplayer

Choose Multiplayer to take turns on the same device. Everyone gets timed turns. The player with the most correct answers wins.

Import / export

Export a SumNinja file when you want to move a player to another device. Send the file with email, a cloud drive, AirDrop, USB, or similar. Import it on the other device to add that player or update the same player there. This is also useful before Multiplayer, so each player can bring their own level and history.

Keyboard shortcuts

Start

1Play fast
2Play accurate
3Open Multiplayer
TOpen Start
EOpen Settings

During a round

EnterSubmit your answer
SpaceFocus the answer box
SSkip a question in Multiplayer
EscFinish the round

Stats

SOpen overview
POpen performance
MOpen achievements
AOpen history

After a round

EnterPlay again
SSee more stats
HOpen this guide

Stats

Overview

Your current level, pace, and practice habits at a glance.

Level snapshot

Recent activity

Recent achievements

Practice calendar

Last 52 weeks

Play a round to fill your calendar.

Training history

Play a round to start your history.

Round details

Select a round to view detailed results.

Achievements Dojo

Unlock badges by keeping your streak alive!

Unlocked 0 of 0 Achievements

0%

What's New

Short, fun stories behind every tweak.

Settings

Mode

Choose whether the round ends on time or only on a wrong digit.

Practice focus

Choose which skills can appear.

Toggle the combos you want SumNinja to cycle through.

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Operator

Number

Digits

Timing window

Tune the countdown that powers each round.

Min time Never dip below this when things speed up. Max time Keep the safety net that slows things down. Seconds per difficulty Adjust how much extra time tougher questions earn.

Smart pacing

Let SumNinja respond to your streaks and slow spells.

Starting level Jump straight to a comfortable starting pace. Adjustment factor Raise this to ramp difficulty faster after a streak. Streak window Average this many rounds to decide when to adjust.

Global preferences

Language

Choose the language used across SumNinja.

Language

Updates

Choose how SumNinja shares its latest tricks.

Show updates on launch Peek at fresh changes when you open the game.

Mental math game for speed and accuracy.

Skills

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How to play

Play together

Players

Multiplayer

Import / export

Keyboard shortcuts

Start

During a round

Stats

After a round

Stats

Overview

Level snapshot

Recent activity

Recent achievements

What's New

Settings

Mode

Practice focus

Timing window

Smart pacing

Language

Updates

Latest highlights