HAPPY PIXEL FROG MATH

Froggy is hungry. But he's picky!

He only eats numbers that fit the rule, and the rule is right there at the top of the screen: even numbers, odd numbers, multiples of 7, perfect squares.

Hop onto a number. Tap to eat it. GULP! Eat every one that fits and you clear the pond.

Watch out for the birds! Birds eat frogs.

THREE WAYS TO PLAY

EASY, ages 4 to 6. Numbers stay small, one gentle bird that never speeds up, and a spare try.

MEDIUM, ages 6 to 9. The full times tables, with birds arriving at levels 4, 8 and 11.

ADVANCED, ages 9 and up. Primes, factors and common multiples, birds from level 2, and the pace climbing fast.

FIFTEEN LEVELS, IN ORDER

Even, then odd. Then multiples of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Then perfect squares, then factors.

Nothing is random. A child meets even numbers first, then meets the same idea again by its other name, multiples of 2, and from there the times tables open up one at a time. Each lap of the ladder the numbers grow.

Every new hazard lands on a rule the player already knows, so nobody is learning math and dodging a bird in the same breath.

THE BIRDS

The pond is not empty. Birds arrive on level four and fly straight across in one row, at one speed, never turning. They cannot be eaten and they will not go around. Later they come in pairs, then threes, and from level six they start scrambling the numbers they pass over, so a tile you were sure about may not say what it said a moment ago. Watch which row a bird is in before you hop. 

THE DRAGONFLY

Every time a new bird joins the pond, a dragonfly appears on the board, glowing inside a magenta halo. Hop to it and gulp it down. Froggy carries that halo for the next eleven seconds, and the birds cannot touch him.

And if he is down to his last frog, a spare one appears somewhere on the board. He only has to reach it.

MADE TO BE KIND

Wrong answers keep their number on screen. The game says "Good try!" and never "Wrong."

Nothing is signaled by color alone. Every state carries a tick, a cross or an outline.

When the round ends, the board opens up and shows what was missed, framed as discovery rather than a score.

Big touch targets, keyboard and swipe controls, and a reduced-motion mode.

ONE FILE, NO STRINGS

Factor Frog is a single HTML file with no external requests whatsoever.

Froggy, the birds and the dragonfly are pixel sprites stored as grids of characters and drawn as vector shapes when the page loads, so they stay sharp at any size. Every sound, from the theme to the gulp to the fanfare when you clear a level, is synthesized by the browser as you play. There are no image files and no audio files anywhere in it.

It runs offline, it runs from a USB stick, and it will still run in twenty years.

HOW TO PLAY

Move: arrow keys, WASD, the on-screen pad, swipe, or just tap a square.

Gulp: spacebar, enter, or the big green button.

Pause: P, or the pause button.

✨ Made with sincerity by a local math teacher. Teach everything you know. Always ask questions. Then ask more. Be a lifelong learner. 

A love letter to the school computer lab. 💖 

🐸 Factor Frog is inspired by the classic game Number Munchers, a staple in North American elementary school computer labs during the late 1980s and 1990s alongside titles like The Oregon Trail.

© 2026 The Happy Pixel Company 🌸