🐍 Snake Classic snake — steer with arrow keys, eat to grow, don't cross yourself. 🧱 Breakout Classic brick breaker — bounce the ball into the wall and clear the board. 🚀 Asteroids A small clone of the classic, doubling as a tour of Ruby 2D fundamentals. 🏎️ Out Run A pseudo-3D arcade racer, classic Sega-style — a rollercoaster of big hills and near-constant curves. 🚙 Hill driver Drive across rolling hills, catch air off the crests, and grab fuel cans 🏃 Platformer playground A tiny side-scrolling platformer scene built from Ruby 2D shapes. 👁️ Ray casting maze A small pseudo-3D maze rendered from a 2D grid by ray casting.

🐦 Boids A flocking simulation governed by separation, alignment, and cohesion. 🌌 N-body Thousands of motes of dust orbit a gravity well, shearing into spiral arms. 🎆 Particle fireworks Click to launch rockets that arc upward and explode into fading sparks. 🏀 Bouncing balls Colorful balls fall under gravity, losing a little energy with each impact. 🪀 Double pendulum Two arms swinging from a fixed pivot, tracing a cycling rainbow trail. 🦠 Conway's Game of Life Paint live cells and watch Conway's classic cellular automaton unfold. 🕸️ Swarm Drifting dots linked to their nearest neighbors form a living mesh.

🌀 Mandelbrot zoomer Click to zoom into the Mandelbrot set, rendered fresh to a Canvas. 🌳 Fractal tree A recursive tree grows, then leafs through the seasons in a procedural breeze. 🦋 Lorenz attractor Lorenz's three-equation convection model traces its butterfly attractor in 3D. ❤️ Fourier epicycles A chain of rotating circles traces a heart — the DFT made visible. 🫧 Marching squares Drifting metaballs merge and split as the iso-line is extracted live. 🌐 3D wireframe A wireframe sphere drawn entirely from 2D Polyline primitives. ✏️ Bezier curve editor Drag the four control points to reshape a cubic Bezier curve live.

🧭 A* pathfinding Paint walls, then watch A*'s frontier fill in and trace the optimal path. 🐭 Maze generator Recursive backtracking carves a perfect maze, then you steer through it. 📍 Travelling salesman (simulated annealing) A 2-opt search wrapped in simulated annealing untangles a 60-city tour.

🎨 Pixel paint An interactive painting app built with Canvas, with a full tool palette. ⭐ Constellations Click to place stars that auto-link to nearby neighbors into emerging patterns. 🔦 2D shadow casting A top-down flashlight paints a lit region behind sharp obstacle shadows. 📊 Dashboard widgets An analog clock, live gauges, and an activity chart built from primitive shapes. 🎛️ UI controls A small control panel made from Ruby 2D shapes: tabs, buttons, toggle, sliders. 🎮 Gamepads Connect one or more controllers, claim a color, then drop into the field. 💎 Logo animation An animated version of the gem logo with staggered assembly and idle shimmer.