[This game is still in beta.]

Welcome to the world of Factor Crafter, where elemental stones obey the laws of multiplication. Prime numbers form the basic elements, and can be combined together to create composite stones. Your job is to craft and dismantle composites like 54 and 98, find the best way to make two stones match, find what two stones have in common, and more.

Fill up your almanac as you multiply Prime Gems and factor Composite Stones, building your understanding of prime factorization and related concepts.

Features 22 levels (eventually 40), an almanac of 100 stones (in-progress), and Sandbox Mode.

Includes preview of: Lowest Common Multiples, Greatest Common Factors, logarithms, algebra, and proportional relationships. More will be available upon release, by purchasing the full game.

Possible Future Features: Teacher's guide, additional games, second sandbox mode. Let me know what other features you want!

U.S. Teachers: This game covers most of common core standard CCSS.Math.Content.4.OA.B.4 (4th grade) and CCSS.Math.Content.6.NS.B.4 * (6th grade). It also features some light algebra, and optional logarithm levels* that make it helpful for high school and college students too!

*Full game only

Design and programming by Jeremy Hoffman (hoffman.jeremy98 [at] gmail.com). Art by Trista Paul (tristagpaul [at] protonmail.com). SFX from soundeffectsplus.com, pacdv.com, and soundimage.org.

Install Instructions:

WebGL (Browser, Chromebook) Extract files, then open "index" file to run in web browser.

Windows PC: Extract files, then open "Factor Crafter" executable file to run.

Android: As this game is not purchased from an app store, you may be warned that the file is not from an authorized source (or "potentially unsafe"). You may need to  edit your settings to let you "install apps from unknown sources". The installable file is stored in your "Downloads" folder. Search 'install apk on [your Android device]' for more information. NOTE: It is indeed possible for itch.io developers to put a virus in their game. Use your judgement before installing apps online.


Factor Crafter PC.zip 24 MB
FactorCrafter - Android.apk 42 MB
Factor Crafter WebGL (Play Offline Using Web Browser) 19 MB


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I LOVE this game. I really enjoy how you taught me all these cool tricks about prime numbers. Yet, still making it fun. This is one of my favorite games!!!

Thank you! Glad you enjoyed it! I'm currently working an adventure/card game set in the same universe, though it could take a while.

I'm already excited!!!  Have a great day.