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Factor samurai is a great way to learn times tables. You play as the samurai whose sacred duty is to cut all the numbers down to their prime factors.

You will be thrown one number after the next, cut them up if they can be factored into smaller values, if not, if they are prime, do not cut them.

Prime numbers are numbers that cannot be divided into small whole numbers. Two, three, five, seven, eleven, and thirteen are all examples of prime numbers. Four is not prime because it can be broken down in the whole numbers two times two.

Factor Samurai will reinforce the arithmetic principles of multiplication and division by continually challenging the player to remember which numbers can be factored into smaller values, and which ones can't.

As the player slices numbers into factors, those factors can be broken down further, until they are split into their prime factors.

Knowing that 63 is 3 times 3 times 7 or that 128 is 2 raised to the seventh power (7 twos!) is how you become a true Factor Samurai!

Factor Samurai is used extensively in the classroom. More than half of the recorded downloads are to public schools.

What's New

Version 1.74

Fix for crash on iOS 8
Fix for score squish on iPhone

Ratings and Reviews



Because I paid for this, I expect it to work. But the third level, that suits the stage of my children, always returns a zero result. So really this should get zero stars. If it were working, I'd give it 4 for the cute and helpful idea that really does reflect how people do mental maths. The wasting away of the fish is too fast on the third level.

Love it!

Big Lap Dawg

Great app if you enjoy killing some time but still using your head. If you are a math teacher, your students will love playing this one. Fools! Don't they know they are learning? Lol.

Fun and educational


Great game. Addictive and makes you think. Game is not broken as a previous reviewer said. Points are deducted if you miss possible factors. If you miss more than you get, you end up with zero. Play an easier level so you can improve.


Third Rail, LLC
138.4 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.
English, French, German, Japanese, Simplified Chinese, Spanish, Swedish
Age Rating
Rated 4+
© 2011 Third Rail Games


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