A little corner to play

A few small browser games built for fun — pure vanilla JavaScript, no frameworks, no downloads. Have a play.

• Snake
• 2048
• Memory match

Free see-and-hear reading tools for dyslexic children and their tutors and parents. A growing set, starting with a phonics word game.

• See-and-hear phonics game
• Whole word, letter names & sounds
• OpenDyslexic font toggle

Three stars, one law of gravity, and pure chaos. A real Newtonian gravity simulation — step through the figure-eight orbit, a famous chaotic setup, and watch a tiny nudge spiral into a different universe.

• Figure-eight & Lagrange orbits
• Pythagorean chaos
• Live energy & chaos ghost

Build your own universe. Click and drag to fling planets, scroll to change their mass, and hit space to watch a cloud collapse into a solar system. Everything pulls on everything, and bodies that touch merge.

• Click-drag to launch
• Spawn a collapsing cloud
• Momentum-conserving merges

The forecast, rendered as ASCII art right in your browser — search any city or use your location. A little homage to wttr.in, with real live data.

• Real data (Open-Meteo)
• Use my location
• Hand-drawn ASCII art

Two rods, one hinge, pure deterministic chaos. Watch a one-in-a-thousand nudge send an identical twin down a completely different path.

• Real RK4 physics
• Chaos twin
• Hypnotic trails

Lifelike flocking from three simple rules — separation, alignment, cohesion. No leader, no plan, just emergence. Tune each rule and watch the swarm change.

• Reynolds' boids model
• Tune the three rules
• Up to 250 boids

Conway's classic cellular automaton. Four tiny rules, and out come gliders, guns and patterns that build other patterns. Draw your own or drop in a preset.

• Draw cells live
• Glider gun & pulsar
• Turing-complete

One equation, infinite detail. Click to zoom into the boundary of the Mandelbrot set — you can keep going essentially forever, and it never stops being intricate.

• Click to zoom
• Real escape-time maths
• Smooth colouring

Draw any shape and watch a chain of rotating circles redraw it — the Fourier transform made visible, the same maths behind audio and image compression.

• Draw your own
• Real DFT
• More circles = crisper

The double-slit experiment, live. Fire particles and an interference pattern builds; measure which slit and it vanishes; erase that knowledge and — impossibly — it returns.

• Fringes build one dot at a time
• Which-path detector
• The quantum eraser twist

The butterfly. Three equations from a toy weather model trace a strange attractor that never repeats — and where "the butterfly effect" got its name.

• RK4, rotatable 3-D trail
• The famous butterfly
• Sensitivity twin

Spots, stripes and coral emerging from two reacting chemicals — the Gray-Scott model, the maths Turing proposed for how animals get their markings. Pick a recipe or paint into it.

• Turing patterns
• Spots / mitosis / coral / maze
• Paint your own seeds

A ripple tank: two sources overlap into constructive and destructive interference. Drag the sources and tune the wavelength — the same physics as the double-slit fringes.

• Superposition, live
• Drag the sources
• Tune wavelength & spacing