PLAY THE BOOK

Thinking in Systems: A Primer

by Donella H. Meadows

A clear guide to how stocks, flows, and feedback loops shape everything from thermostats to economies. In this world you practice spotting system traps like escalation and eroding goals, and learn to find the leverage points that create lasting change rather than quick fixes.

Play the demo Get on Amazon

33 maps · 161 characters · 547 questions · free to try, no account needed · book links are affiliate links

Two ways to play the same book. Walk the maps and challenge the characters.

Loading the demo…

Arrow keys to walk, Space to talk or fight. Use the on-screen controls to walk and talk. Signs hold the book's ideas; every character is a quiz.

What's inside

33 maps, 161 characters and 547 questions, all generated from the book.

MAP 01

Forest of Fundamentals

Introduction to systems: what they are and why they matter.

5 characters · 17 questions

MAP 02

Stock and Flow Caverns

Understand the basic building blocks: stocks and flows.

5 characters · 17 questions

MAP 03

Bathtub Dynamics Isle

Explore the classic bathtub model of stocks and flows.

5 characters · 17 questions

MAP 04

Feedback Loop Fortress

Discover how feedback loops regulate system behavior.

5 characters · 17 questions

MAP 05

Balancing Loop Bastion

Study balancing feedback loops that seek stability.

5 characters · 17 questions

MAP 06

Reinforcing Loop Ridge

Examine reinforcing loops that drive growth or collapse.

5 characters · 17 questions

MAP 07

Thermostat Temple Ruins

Learn how heating systems illustrate feedback structures.

5 characters · 17 questions

MAP 08

Population Growth Plains

Analyze population dynamics through births and deaths.

5 characters · 17 questions

MAP 09

Industrial Economy Depths

See how reinforcing and balancing loops shape economies.

5 characters · 17 questions

MAP 10

Delay Desert

Understand how delays affect system behavior and oscillation.

5 characters · 17 questions

MAP 11

Oscillation Ocean

Explore systems that swing between extremes over time.

5 characters · 17 questions

MAP 12

Nonlinear Nexus Cave

Discover how nonlinear relationships defy simple prediction.

5 characters · 17 questions

MAP 13

Resilience Reef

Learn what makes systems resilient to shocks.

5 characters · 17 questions

MAP 14

Self-Organization Sanctuary

Study how systems organize themselves without central control.

5 characters · 17 questions

MAP 15

Hierarchy Highlands

Examine how systems nest within larger systems.

5 characters · 17 questions

MAP 16

System Boundary Borderlands

Understand the challenge of defining system boundaries.

5 characters · 17 questions

MAP 17

Limits to Growth Glacier

Explore why exponential growth meets environmental limits.

5 characters · 17 questions

MAP 18

Success-to-the-Successful Swamp

See how advantage compounds inequality in systems.

5 characters · 17 questions

MAP 19

Tragedy of the Commons Trench

Study depletion of shared resources by self-interest.

5 characters · 17 questions

MAP 20

Escalation Volcano

Examine arms races and competitive escalation traps.

5 characters · 17 questions

MAP 21

Drift to Low Performance Caves

Learn how eroding goals lower system standards.

5 characters · 17 questions

MAP 22

Addiction Trap Ruins

Explore dependency loops and policy resistance.

5 characters · 17 questions

MAP 23

Rule-Beating Ridge

Discover how systems evade constraints creatively.

5 characters · 17 questions

MAP 24

Seeking the Wrong Goal Desert

Understand how misaligned goals distort behavior.

5 characters · 17 questions

MAP 25

Leverage Points Lighthouse

Identify the most powerful places to intervene in systems.

5 characters · 17 questions

MAP 26

Parameter Tweaking Plains

Explore why adjusting numbers is often weak leverage.

5 characters · 17 questions

MAP 27

Buffer and Structure Bastion

Study the power of stocks, buffers, and structure.

5 characters · 17 questions

MAP 28

Information Flow Ice Fields

Learn how missing feedback loops distort systems.

5 characters · 17 questions

MAP 29

Rules and Incentives Ruins

Examine how rules shape system behavior deeply.

5 characters · 17 questions

MAP 30

Paradigm Shift Peaks

Discover how changing mindsets transforms systems.

5 characters · 17 questions

MAP 31

Transcending Paradigms Temple

Explore the deepest leverage: transcending paradigms.

5 characters · 17 questions

MAP 32

Systems Wisdom Sanctuary

Reflect on humility, uncertainty, and systems ethics.

5 characters · 17 questions

MAP 33

Living with Complexity Citadel

Synthesize lessons for navigating complex real-world systems.

1 characters · 3 questions

How the book becomes practice

Reading puts ideas in. Retrieval keeps them there. The game is the retrieval.

Walk the world of the book

33 maps, one per part of the book. Signs along the way hold its key ideas, so the walk itself is a refresher.

Battle the characters

161 characters, each a short quiz on one idea. Answer well and the map opens up; a boss guards the end of each one.

Missed ideas come back

Every question you get wrong is re-asked in rematches and boss fights until you get it right. That is the part that makes it stick.

Keep what you learn

Sign up for free and your demo progress, XP and best tower stage move to your account. Come back whenever a chapter starts to fade.

Questions

Is this the actual book?

No. This is a quiz game built from the ideas in "Thinking in Systems: A Primer": 547 multiple-choice questions with explanations, spread over 33 maps. It works best alongside the book, which is why the page links to where you can get it.

Is it free to play?

You can play the demo on this page without an account (5 battles in the RPG and 10 questions in the tower). Sign up for free to keep going; premium worlds come with a preview and Lifetime Pro unlocks everything.

Do I need to have read the book?

It works either way. If you have read it, the game is spaced repetition for what you learned. If you have not, every question comes with an explanation, so the game is a fast tour of the main ideas.

Does my demo progress carry over?

Yes. Sign up from the game and the characters you beat, your XP and your best tower stage move to your account.

Are the book links affiliate links?

Yes. If you buy the book through one of them we may earn a small commission, at no extra cost to you. It helps keep the free worlds free.