Each game has a secret mathematical function. It takes any integer you give it and returns an integer output. Your job is to figure out what that function is.

Use the keypad to enter any integer and tap PROBE. The number passes through the hidden function and the output appears on the right side of the box.

You have 5 probes total (8 on Hard). Use them wisely.

When you think you know the function, tap SOLVE. You'll be given 2 new inputs you haven't seen before. Provide the correct output for both to win.

A wrong answer costs you 1 probe and returns you to probing. Keep trying to solve as long as you have probes left.

Easy — simple rules: addition, multiplication, squaring, absolute value

Medium — more complex: quadratics, shifted absolute value, conditional rules, digit-based rules

Hard — challenging: cubics, multi-term quadratics, conditional rules that combine different function types. You get 8 probes on this difficulty.

Prōble does not collect, store, or share any personal data. No accounts, no tracking, no cookies. Game state (such as today's puzzle completion) is stored locally on your device only and never transmitted anywhere. If you have questions, contact email@email.com.