📖 Diffy Books · free · read or listen
Made by Design
Chapter 3, Material World, visits a factory where one costly mold makes parts cost pennies.
Read the chapter →Chapter 3: Material World · about 6 min
Algebra & modelsAges 9–14
Algebra Workshop: fix Bolt’s wonky machines
Start here: Mystery power packs · Balance the scale to find the mystery number. · About 3 minutes
Play Mystery power packs →No account needed · Nothing to download.
Take bolts off both sides of a balance to find the mystery number, run a machine backwards and tune a number bot: six short missions with three visual challenges each. An optional Number Lab takes the ideas further with detailed equations and models. All activities are open without login; sign in to save progress and view family reports. Diffy measures product use to improve the service.
No ads, ever
Product use measured
Free to play
Plays in any browser
What kids learn
- Keep a balance level by doing the same thing to both sides
- Undo a two-step machine in reverse order to find what went in
- Find a number bot’s secret rule from two input and output clues
- Find two mystery values that make two clues true at once
- Split a cost into a one-time rent and a price for each sticker
- Work out the fewest whole bots that reach a target without going over capacity
How it works
Operate both sides of a balance, run an inverse machine, tune function rules and solve two clues at once. Each mission has three generated challenges, visible consequences, optional clues and unlimited retries. Number Lab retains the detailed numerical cases and production modeling. Guest practice is temporary.
Kids can play without signing in; guest stars stay until you reload or close the page. A grown-up signs in once and adds a player for each kid, so Algebra Workshop's stars and progress save to your account and follow you to any device.
Read the comic that goes with it
Also try
- Data DetectiveAges 9–14
Join Pip the owl: catch tricky charts and solve six data mysteries.
Play Data Detective → - MathBlastAges 6–13
45-second math blasts and calm practice: sums, tables, fractions.
Play MathBlast →
Ready to play Algebra Workshop?
It's free and has no ads. Diffy measures product use to improve the service. Ages 9–14.