Flexbox Froggy - Learn CSS Flexbox in the Browser - Free Tool Online

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Flexbox Froggy is a free browser game that teaches CSS flexbox. Type flex properties in the editor to move frogs onto matching lilypads across 24 levels. About ~1.0 MB after Play, no install, no account.

Want another free browser puzzle? Try Pipe Rotate Puzzle. Want a typing race instead? Try Cat Typing Race.

FLEXBOX FROGGY

Write CSS flexbox in the left editor to seat frogs on lilypads. 24 levels from justify-content to flex-wrap. Progress saves in this browser under ftol:flexboxfroggy keys. Adapted from Thomas Park's Flexbox Froggy (MIT). About ~1.0 MB.

Keyboard + mouse. Best on a wide screen so the editor and pond sit side by side.

Press Play to load the game.

Level progress uses namespaced localStorage (ftol:flexboxfroggy:*).

Welcome to Flexbox Froggy - a free browser CSS flexbox teaching game with no account or install. Write flex properties so frogs hop onto matching lilypads across 24 levels. About ~1.0 MB loads after you press Play. Progress stays in this browser under namespaced ftol:flexboxfroggy keys; use Reset in the level menu to clear saved answers. Nothing is uploaded; play stays on-device. For more free browser games, open the games hub. Related picks: Pipe Rotate Puzzle and Vim Motion Academy.

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Last updated: Jul 21, 2026

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Frequently Asked Questions

What is Flexbox Froggy?

A free browser game that teaches CSS flexbox across 24 levels. You type flex properties so frogs land on lilypads.

How do I play?

Press Play, read the instruction, type CSS in the editor (for example justify-content: flex-end;), then click Next when the frogs are seated.

Does it save progress?

Yes, in this browser under namespaced keys ftol:flexboxfroggy:level, answers, solved, and colorblind. Use Reset in the level menu to clear.

How big is the download?

About ~1.0 MB of HTML, CSS, JavaScript, SVG art, jQuery, and animate.css after you press Play.

Is this open source?

Yes. Adapted from Flexbox Froggy by Thomas Park under the MIT license. This site build strips ads/analytics/CDN fonts, vendors jQuery locally, and adds noindex.

Is it good on a phone?

It runs, but the editor plus pond layout is designed for a wider screen. Use landscape or Fullscreen when space is tight.