Arcade
Small games where the science is the mechanic. Every one is open, none is timed, and losing costs nothing but the run.
games
Open right nowlevels
Across every gamesubjects
With a shelfReal-time, with step mode
Pick a game
Each game runs on the same model layer the lessons use, so the number that burnt out a lamp or starved a reactor is the one a chapter would have computed.
Chemistry
- 4 levels
Limiting Reagent
Keep the production line fed by getting the mole ratio right.
About 3–10 minutes a runPlay Limiting Reagent - 4 levels
The Blind Titration
Find a titration's endpoint with an indicator and a burette, then state the unknown acid's concentration.
About 4–12 minutes a runPlay The Blind Titration - 4 levels
Equilibrium Tug
Shift a reversible reaction to hit a yield target, with Le Chatelier's principle as the rulebook.
About 3–12 minutes a runPlay Equilibrium Tug
Physics
- 3 levels
Circuit Breaker
Light every lamp inside its rating by choosing what carries the current.
About 3–10 minutes a runPlay Circuit Breaker - 5 levels
Optic Bench
Steer light to a target with mirrors, lenses and slits, aiming by the laws of reflection, image formation and interference.
About 3–12 minutes a runPlay Optic Bench - 5 levels
Bridge the Gap
Build a truss that carries the load across, and read every member's tension or compression in the statics that condemned or spared it.
About 5–20 minutes a runPlay Bridge the Gap
Mathematics
- 4 levels
Counterexample Hunter
Build the number that refutes the claim.
About 2–8 minutes a runPlay Counterexample Hunter - 5 levels
Tiling Court
Cover the figure exactly. Area is conserved, and it will tell on you.
About 3–10 minutes a runPlay Tiling Court - 5 levels
The Conjecture Engine
State a rule the hidden process obeys, then let the engine try to kill it.
About 5–20 minutes a runPlay The Conjecture Engine
Biology
- 4 levels
Punnett Runs
Breed a line that breeds true for a target phenotype, reading genotypes you cannot see from the offspring they produce.
About 4–15 minutes a runPlay Punnett Runs - 5 levels
Drift
Shepherd an allele through bottlenecks, founder events and selection without letting Wright–Fisher sampling fix it or lose it.
About 3–12 minutes a runPlay Drift - 4 levels
Homeostat
Hold a regulated variable inside its band by working the body's effectors against a disturbance — negative feedback, with gain and lag, by hand.
About 3–15 minutes a runPlay Homeostat
Earth Science
- 4 levels
Strata
Read the rock: order the events that wrote a section from what cuts what and what rests on what.
About 3–12 minutes a runPlay Strata - 5 levels
Monsoon
Route the moisture: lift the onshore air past its cloud base where you want rain, and keep it wet where you want it to reach.
About 4–15 minutes a runPlay Monsoon - 4 levels
The Long Now
Sequence deep time against three independent clocks — uranium–lead, fossils and superposition — and let them check each other.
About 4–15 minutes a runPlay The Long Now
Astronomy
- 4 levels
Orrery
Place worlds round a star at a radius and a speed, and find an arrangement gravity lets last a hundred orbits.
About 3–12 minutes a runPlay Orrery - 5 levels
Star Field
Pick constellations and their brightest stars out of a real sky, computed for a latitude, a date and a light-polluted limiting magnitude.
About 3–12 minutes a runPlay Star Field - 5 levels
Transfer Window
Plan burns and a departure date that carry a craft from Earth to another world on the delta-v you have.
About 4–15 minutes a runPlay Transfer Window
Runs stay on this device. Nothing you do in the Arcade is sent anywhere or added to your profile.