Now on Android

Function Plane

A puzzle game about f(x).

Draw curves with equations. Roll a ball through gravity. Collect every star. A minimalist puzzler for anyone who ever loved — or feared — a graphing calculator.

Play online on any device All platforms

Now on Google Play, and in any browser.

7packs
70levels
210stars
What it is

Math you can play.

Every level is a tiny physics puzzle. Write equations, watch them become curves, and let gravity do the rest.

Draw with equations

Type y = sin(x), x² + y² = 25, or y = 0.5x − 1. The plane updates as you type.

Real physics

The ball obeys gravity, friction and momentum. Curves become tracks. Loops become launchpads.

Press play, watch it run

Tweak, replay, retry. No timers, no penalties — just the satisfaction of a perfectly placed parabola.

70 levels across 7 packs

Five chapter packs plus Linear and Trigonometry. Earn 210 stars across slopes, curves, reflections and more — with more packs on the way.

Built for thumbs

A custom math keyboard appears when you need it. Symbols, operators, and exponents one tap away.

No ads, no tracking, ever

No advertising, no analytics, no third-party requests. The game bundles everything it needs and talks only to its own backend — to save your progress, and to send anonymous crash reports that are tied to no one and deleted after thirty days. Buying Premium goes through Google Play, and only if you choose to. Play on a plane, on a couch, on a lunch break.

How to play

Three steps. Endless puzzles.

  1. 01

    Set the goal

    Guide the ball from its start position to every star on the plane. All stars must be collected for a level to complete.

  2. 02

    Write equations

    Tap Add and type any equation: y = sin(x), x² + y² = 25, y = 0.5x − 1. The custom math keyboard does the symbols for you.

  3. 03

    Press Play

    The ball drops from its starting position and rolls along your curves. Press Stop any time to reset and adjust.

Get the game

Free to play. Yours to solve.

Any device Play in browser
Play now
Get it on Google Play
Available now
Soon on App Store
Coming soon

Free on Google Play, with one optional purchase that unlocks every pack. The browser version plays the same game and shares your account; it installs as an app from there too.

Contact

Stuck on a level? Found a bug?

We read every email. Bug reports, feature requests, and screenshots of beautiful solutions all welcome.

Email support
functionplane.support@gmail.com