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33 results in fun · clear-
Boids Flocking
Four hundred birds, no leader and no plan: each one looks only at the neighbours inside its own small radius and obeys three…
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Comet Trail
A glowing comet that chases your cursor, trailing hue-shifting sparks. Move the mouse — it eases toward you. My first post,…
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Pocket Synth
A playable two-octave synthesiser with no sound files behind it: every note is a pair of detuned oscillators built the instant…
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100k Particles
A hundred thousand specks of light, all obeying the same two lines of arithmetic: fall toward the pointer under a softened…
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Pixel Icon Painter
A browser tab gives an icon a 16 × 16 grid and nothing more, so every pixel is a decision — two of them decide whether a face is…
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Game of Life
Conway's Life on a canvas you can draw on: one rule about eight neighbours, no plan and no randomness, and out of it come…
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Sunflower Mathematics
A sunflower head is built by one rule repeated fifteen hundred times: drop a seed, turn a fixed angle, drop another — and at…
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Lens Lab
A magnifying glass, a camera and a film projector are the same piece of curved glass; the only thing that changes is how far away…
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Double Pendulum
Two rods, two weights, one pivot — the simplest machine with no closed-form solution, integrated here with RK4 at 240 steps a…
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Focus Timer
The classic pomodoro — 25 on, 5 off, a long rest every fourth round — built around a ring that earns the space it takes: the arc…
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Reaction Timer
Wait for the panel to turn green, then hit it — click, tap, or space — five times, and your average lands in big mono type. The…
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Spirograph
The plastic toy from a childhood drawer, rebuilt as arithmetic: pin a toothed ring, roll a smaller gear around the inside, drop a…
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Star Map
A whole night sky in a box: 533 real stars drawn at their true positions and brightnesses, wired to 66 constellation figures and…
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Falling Objects Race
Three everyday things — a feather, a tennis ball and a brick — are released from the same height at the same instant, and the…
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Typing Speed Test
A sixty-second typing test on three short pieces of ordinary prose — a slow morning, a second-hand bookshop, a walk up a river…
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Breakout
It is already playing when you arrive — a small auto-player keeps the ball alive until you move the mouse or press an arrow key,…
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Cipher Wheel
A letter-shift puzzle you can turn with your hands: two lettered rings, one message, and a number that says how far the alphabet…
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Dice Probability Lab
Roll one to six dice as many times as you like and watch the histogram of sums pile up underneath the exact theoretical curve…
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Fractal Explorer
The Mandelbrot set falls out of one absurdly short rule applied to every pixel — start at zero, square it, add the pixel's own…
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Galton Board
A bean machine you can watch think: every ball flips a coin at each peg row — left or right, twelve times, nothing else — so no…
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2048
Faithful 2048 — slide, merge, reach the tile everyone remembers — except it never hands you an empty board. A depth-2 expectimax…
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Prime Spiral
Write the whole numbers in a square spiral — 1 in the middle, then round and round — and light up only the primes. They are…
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A Proof You Can Drag
Two boxes of exactly the same size, four identical right triangles going into each — so whatever space is left over has to match,…
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QR Code Maker
Type a link or a note and a real, scannable QR code assembles itself as you type — nothing uploaded, nothing fetched, the entire…
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Snake
It is already playing when you arrive — a small solver drives the snake, and it only chases the apple when it can still trace a…
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Unit Converter
Two live inputs that chase each other: type on either side and the other one follows, because both sides read from a single…
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Word Guess
Five letters, six tries, and a counter that tells you exactly how much you still don't know: the page opens mid-round with an…
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Minesweeper
The classic deduction game, rebuilt as an instrument panel: mines left, elapsed time and your best run sit in mono readouts above…
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Estimating π with Darts
Darts rain onto a square with a circle drawn inside it. The circle covers exactly π/4 of the square, so four times the share of…
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Projectile Playground
A slingshot, a bucket, and the one thing the physics textbook quietly leaves out: every shot draws both the dashed parabola you…
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Meeting Overlap Finder
Pick two to four cities and their working days stack onto one 24-hour strip, with the slice where everyone is genuinely at a desk…
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Birthday Paradox
Twenty-three people is enough for a coin flip that two of them share a birthday, and almost nobody believes it until they watch…
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Memory Match
The card game everyone already knows, with an instrument panel bolted on — and it is already playing when you arrive. A demo…
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