Each day there is one small puzzle. Set something up, guess how it will go, then watch it play out. You keep your own notebook of what you find, and nobody is keeping score but you.
A reason to come back
Every simulation is still open for free play. Cases give you a goal: hit a number, guess before you run, find what the model does that you did not expect. Your rank, discoveries and results live in your own browser.
Short trails of cases that build one idea, from why buses clump to how a rumour is stopped.
Buses that clump, cars that weave, and a road that slows without a cause.
Amber, arrows and queues: what makes a junction flow.
Carts, a cradle and a truck: what is kept in a collision, and what is not.
A meadow that can crash, and a habit that can be broken.
Four neighbours and a bank: who is squeezed when prices rise.
Move a slider, flip a switch, or break something on purpose.
The whole system answers while it runs, not after.
Each one comes with a plain account of what happened, and its sources.
Each one is a working model, not an animation. Change a number and the whole system answers.
Traffic World
Buses circle a 25 km route, one every eight minutes. Let a stop get busy, or a light hold one bus, and watch an even timetable turn into long gaps and bunches of buses arriving together.
traffic World
Dozens of cars share a closed road. One brakes hard, then drives on, and the slowdown it started runs backwards through the traffic with nothing in the way.
traffic World
A four-way junction with left-turn arrows and amber lights. When a light turns green, how quickly the waiting queue sets off decides how many cars get through.
nature World
Foxes hunt rabbits across a meadow. Every animal is an individual that eats, breeds, starves or gets caught. Tap one to follow it, change the rules, and watch the populations boom, crash or disappear.
people World
A small town hears something. Follow it for a whole year: who tells whom, how the story changes, which version wins, and how it ends. There are 9,999 different stories.
people World
Follow one person from a first cigarette on a night out, through getting hooked, to the day they try to stop. Watch nicotine fit into the brain, the need grow, and the habits that keep pulling.
physics World
Carts, pool balls, curling stones, cars and bowling balls collide on a track. Change the masses, speeds and bounciness and follow where the momentum and the energy go, collision by collision.
economy World
Prices drift upward month by month. Watch four neighbours and a bank on one street: who gets squeezed first, who gets caught out by a rent renewal, and what a central bank can do.
The Tinkerarium keeps one world for each kind of system. Step into one and change something.
Tinker with traffic, congestion, and how small changes have big effects.
Experiment with motion, forces, energy, and more.
Explore ecosystems, populations, and the balance of life.
See how choices affect markets, prices, and resources.
Discover how people behave, make decisions, and influence each other.
Each one opens a simulation with that scenario already set up.