The deck of a book
Every question is also a flashcard, scheduled over days. Flip a few from a real book.
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Space to flip, 1–4 to grade.Tap the card to flip it, then tap a grade. Your progress moves to your account when you sign up.
How a book becomes a quiz
Upload once; the book does the asking from then on.
Upload the book
An EPUB or a PDF up to 50 MB, in any language. Non-fiction works best: a business book, a history, a textbook, a manual.
Its key ideas become the syllabus
The book is read for every key idea, chapter by chapter, and each gets questions. Two readers of the same book are quizzed on the same ideas.
Play it, or flip it
Walk the world and battle, or drill the same questions as flashcards scheduled over days. Missed ones come back; what you know gets out of the way.
Books you can play right now
Public worlds built from popular books: pick one and start, no upload needed.
Showing the books in English. Books in other languages
Blue Ocean Strategy: How to Create Uncontested Market Space and Make the Competition Irrelevant
by W. Chan Kim and Renée Mauborgne
This book shows how companies break free from cutthroat competition by creating new market space instead of fighting over existing demand, using tools like the strategy canvas and the four actions framework. In this world you practice mapping value curves, reaching noncustomers, sequencing price and cost decisions, and overcoming organizational hurdles to execute bold strategic moves.
EN122 characters · Play
High Output Management
by Andrew S. Grove
Andrew Grove's classic distills managerial work into production principles: leverage, output, and the systems that make teams effective. In this quiz world you practise planning, running one-on-ones and reviews, delegating with accountability, and designing processes that catch problems early and motivate real performance.
EN101 characters · Play
$100M Offers: How to Make Offers So Good People Feel Stupid Saying No
by Alex Hormozi
A practical guide to building offers so compelling that price stops being an objection, covering value creation, guarantees, scarcity, urgency, and bonuses. In this world you practice calculating lifetime value, deconstructing the value equation, and assembling all the pieces into a single Grand Slam Offer.
EN121 characters · Play
Zero to One: Notes on Startups, or How to Build the Future
by Peter Thiel
Peter Thiel argues that true progress comes from creating something genuinely new rather than copying what already works, and shows how monopolies, strong founding teams, and definite plans drive lasting success. In this world you practice spotting hidden opportunities, building a founding team with real cohesion, and designing sales and distribution strategies that actually work.
EN101 characters · Play
What They Don't Teach You at Harvard Business School
by Mark H. McCormack
A veteran deal-maker distills the unwritten rules of business savvy: reading people, negotiating with leverage, managing time, and shaping perceptions. Players practice sizing up situations, handling office politics, and building client trust through practical, street-smart tactics rather than textbook theory.
EN96 characters · Play
The Personal MBA: Master the Art of Business
by Josh Kaufman
A practical guide to the core ideas behind value creation, marketing, sales, finance, and systems thinking that drive any successful business. Explore twenty-three worlds covering everything from customer psychology to financial statements, and practice applying timeless mental models to real decisions.
EN111 characters · Play
Make: The Indie Startup Manual
by Pieter Levels
A practical guide to building a solo internet startup from personal problem to profitable exit, written by the maker behind Nomad List and Remote OK. You'll practise spotting ideas from your own life, launching without hype, growing organically, monetizing directly, automating operations, and negotiating a sale.
EN121 characters · Play
Founding Sales
by Pete Kazanjy
A practical guide to building an early-stage sales function from scratch, covering mindset, prospecting, narrative, negotiation, and hiring. Play through founder-led selling: crafting a compelling story, handling objections, managing pipeline, and scaling a repeatable go-to-market process.
EN121 characters · Play
The Mom Test: How to Talk to Customers and Learn if Your Business is a Good Idea When Everyone is Lying to You
by Rob Fitzpatrick
A practical guide to running customer conversations that surface truth instead of polite lies, so you can validate a business idea before building the wrong thing. In this world you practice spotting empty compliments, anchoring vague claims into specifics, finding the right people to talk to, and steering conversations toward real commitments.
EN146 characters · Play
Traction: How Any Startup Can Achieve Explosive Customer Growth
by Gabriel Weinberg and Justin Mares
This book distills how startups find their first customers and scale growth, covering 19 traction channels and the Bullseye framework for testing and prioritizing them. In this world you practice choosing, testing, and doubling down on the channels that actually move the needle for your business.
EN311 characters · Play
The Subtle Art of Not Giving a F*ck
by Mark Manson
This book argues that a good life comes not from chasing endless positivity but from choosing your struggles and values with care. Through Mark Manson's blunt, story-driven philosophy, you'll practice telling meaningful problems from trivial ones, taking responsibility without blame, and facing failure and mortality as sources of clarity rather than fear.
EN116 characters · Play
Deep Work: Rules for Focused Success in a Distracted World
by Cal Newport
Cal Newport argues that the rare ability to focus without distraction is becoming increasingly valuable, and shows how to cultivate it. Explore rituals from Carl Jung to modern professionals, and practise strategies like scheduling, shutdown routines, and cutting shallow work to build lasting concentration.
EN136 characters · Play
How To Win Friends and Influence People
by Dale Carnegie
A classic guide to human relations, teaching how to make friends, win people over, and lead without causing resentment through honest appreciation and genuine interest. Players practice recognizing key techniques through real stories about historical figures, salespeople, and everyday encounters.
EN161 characters · Play
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.
EN161 characters · Play
Peak: Secrets from the New Science of Expertise
by Anders Ericsson and Robert Pool
This book explains how deliberate practice, not innate talent, builds extraordinary ability in music, chess, sports, and everyday skills. In this world you practice identifying strong mental representations, structuring focused feedback loops, and applying purposeful training to your own goals.
EN156 characters · Play
The Lean Startup
by Eric Ries
This book explains how startups can use validated learning, rapid experimentation, and the Build-Measure-Learn loop to build products people actually want, instead of following rigid business plans. In this world you practise identifying leap-of-faith assumptions, designing MVPs, reading actionable metrics, and deciding when to pivot or persevere.
EN156 characters · Play
Principles: Life and Work
by Ray Dalio
Ray Dalio distills the life and management principles behind his personal journey and Bridgewater's success, covering radical truth, meaningful relationships, and systematic decision-making. In this world you practise embracing reality, using the 5-step process, weighing believability, and diagnosing problems to build your own effective machine.
EN161 characters · Play
The Art of War
by Sun Tzu
A classic treatise on strategy, leadership, and the calculated use of force, translated by Lionel Giles. In this quiz world you practice reading its core teachings on planning, deception, terrain, timing, and espionage, sharpening how you assess situations and make decisions under pressure.
EN28 characters · Play
The Almanack of Naval Ravikant: A Guide to Wealth and Happiness
by Eric Jorgenson
A collection of Naval Ravikant's tweets, essays, and interviews on building wealth through leverage and specific knowledge, and finding happiness through presence and acceptance. Players practice applying his principles: recognizing forms of leverage, judging long-term partnerships, and building daily habits for a calmer, clearer mind.
EN116 characters · Play
The ONE Thing: The Surprisingly Simple Truth Behind Extraordinary Results
by Gary Keller and Jay Papasan
This book explains why narrowing your focus to a single priority produces better results than juggling many goals, and dismantles common myths about willpower, balance, and multitasking. In this game world you practice asking the Focusing Question, time blocking your most important work, and building the habits that protect your ONE Thing.
EN131 characters · Play
Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones
by James Clear
This book explains how tiny, consistent changes compound into remarkable results, using the Four Laws of Behavior Change to build good habits and break bad ones. In this world you practice designing your environment, stacking habits, tracking progress, and using identity-based thinking to make lasting change stick.
EN161 characters · Play
Think Faster, Talk Smarter: How to Speak Successfully When You're Put on the Spot
by Matt Abrahams
A practical guide to mastering impromptu speaking, from calming nerves to structuring thoughts on the fly. You'll practice frameworks for toasts, pitches, feedback, and apologies while learning to listen actively and speak with authentic confidence in any unplanned moment.
EN161 characters · Play
The MrBeast Production Academy
by Jimmy Donaldson
An internal playbook distilling a decade of lessons on making high-retention YouTube videos, from ideation and hooks to production logistics and team culture. In this world you practice spotting virality metrics, crafting strong hooks, structuring formats for retention, and running a production with clear communication and priorities.
EN22 characters · Play
The Adweek Copywriting Handbook
by Joseph Sugarman
Sugarman breaks down the psychology behind persuasive writing, from crafting irresistible first sentences to triggering the 31 buying motivators that drive purchases. Players practice building buying atmospheres, overcoming objections, and structuring copy that flows like a slippery slide toward the sale.
EN161 characters · Play
Why a quiz beats a summary
A summary tells you what the book said. A quiz finds out whether you still know.
Recall, not recognition
Rereading and highlighting train you to recognise a sentence. A question makes you produce it, which is what remembering is.
Spaced over weeks
The flashcard deck schedules each question by how well you knew it, days apart, so a book read in January is still yours in June.
Chapter by chapter
The maps follow the book, so you can quiz yourself on the chapter you just finished and come back to the earlier ones later.
Your books, your language
The questions come out in the language of the book, and any text works: a translation, a textbook, a report, a classic from a free library.
When another tool fits better
Three cases where you want something else.
The book has DRM
A Kindle or Apple Books file cannot be uploaded: it is locked, not a plain EPUB. A DRM-free EPUB or a PDF from the publisher or a library works.
It is a novel
Fiction gives few key ideas to ask about, and the questions turn into plot trivia. Non-fiction, textbooks and manuals are where it shines.
You want a quiz for your readers
This quizzes you on a book you are reading. It does not build a marketing quiz an author sends out, or a reading test to grade a class on paper.
Built on real books
Live numbers, straight from the database.
Questions
Does it accept EPUB?
Can I upload a Kindle book?
Does it work for novels?
Which books are already playable?
How is this different from a summary?
Is it free?
See also
Free to start
Play the free worlds for as long as you like. Pay once when you want your own books in.
- Unlimited play on free public worlds
- A taste of premium worlds: 5 battles, 10 tower questions and 10 mini-game questions each
- Live duels with friends, classmates or the computer
- All five modes, on any device
- Progress saved to your account
Launch price for the first 100 buyers or until 31 Dec 2026, then $49.99. 97 of 100 left.
- Turn your own notes into games (3 book-to-game credits)
- Unlimited battles on every world
- Unlimited mini-game questions on every world
- Duels on every map of every premium world
- Every premium world, every map, all five modes
- Your own flashcards in any world (up to 200)
- Study timer extras: room themes, window views, pets and focus insights
- Classrooms: share the worlds you generate with your students, who join free
- All future updates included
Need more later? Extra book-to-game credits are $4.00 each, 5% off from 3, 10% off from 5 and 20% off from 10.