Mondo Knows

Hello, I am Mondo

Free games, trivia, puzzles and calculators

Play something fun. Learn something surprising. Challenge yourself. Free browser games, daily trivia and puzzles, and calculators that show their working, with nothing to sign up for.

Mondo Knows is one place to play and to work things out. There are 125 browser games, 900 trivia questions, 5 puzzles, 6 quizzes, 6 skill challenges, 2,600 sourced facts and 230 calculators. No sign-up, no adverts in the way. Scores and streaks stay on your device, and the only thing that leaves it is anonymous page-view analytics, which runs only if you allow it.

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All 125 games

No download, no install, and they work on a phone.

Mondo SnakeEat, grow, and do not bite your own tail.1-5 minutesMemory MatchFlip the cards and find every pair.1-3 minutesBlock MergeSlide the tiles and merge your way to 2048.3-10 minutesTic-Tac-ToeThree in a row, against a red panda.Under a minuteSliding PuzzleSlide the tiles back into order.2-8 minutesNumber GuessMondo is thinking of a number. Find it.Under a minute

Today's challenges

Four short things, the same for everyone today. Finish them and your streak grows.

Daily TriviaTen questions on today's themeDaily WordSix guesses at a five-letter wordDaily LogicFive number sequences to crackMemory TestHow many items can you hold?
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Explore your interests

All trivia

Fifteen subjects, each with its own questions and explanations.

🎓 General Knowledge🗺️ World Geography🏛️ History🔬 Science🐾 Nature & Animals🎬 Movies & Television🎵 Music🏅 Sports🍳 Food & Cooking💻 Technology🪐 Space & Astronomy📚 Literature🌟 Famous People🇺🇸 American History🌏 World Cultures

Discover something interesting

All facts
A day on Venus is longer than its yearVenus turns so slowly that its day outlasts its trip around the SunSource: NASA ScienceVenus is the hottest planet in the solar systemThick greenhouse gases trap heat to make Venus hotter than MercurySource: NASA ScienceThe Moon is slowly drifting away from EarthLuni-solar tidal friction pushes the Moon outward by roughly four centimetres each yearSource: NASA Science

More to explore

Jigsaw PuzzleTwenty photographs, cut into interlocking pieces you drag home.Mondo WordGuess the five-letter word in six tries.What Is Your Thinking Style?Analytical, creative, practical or exploratory?Which Travel Style Fits You?Adventurer, planner, explorer or relaxer?Reaction Time TestHow fast can you react when the screen changes?Memory SpanHow many items can you hold in your head at once?

Useful tools

All 230 calculators

The original Mondo Knows: instant answers, with the formula shown.

Mortgage CalculatorMonthly payment on a home loan, including tax, insurance, HOA and PMI.💰 Money & FinanceBMI CalculatorBody mass index with a healthy-range read-out.🌿 Health & FitnessPercentage CalculatorEvery common percentage question in one place.➗ MathLoan CalculatorPayment, total interest and total cost for any fixed-rate loan.💰 Money & FinanceAge CalculatorYour exact age in years, months and days.🧭 Everyday & TechCalorie CalculatorDaily calories for losing, keeping or gaining weight.🌿 Health & FitnessTip CalculatorTip and per-person total for a bill.🧭 Everyday & TechCompound Interest CalculatorGrowth with compounding and optional regular deposits.💰 Money & Finance
💰 Money & Finance (74)🌿 Health & Fitness (29)➗ Math (42)🧭 Everyday & Tech (51)🎲 Randomizers & Pickers (21)📐 Unit Converters (13)

What Mondo knows

Seven shelves, and each one is growing.

Mondo Knows GamesFree browser games you can play right nowMondo Knows TriviaTest your general knowledgeMondo Knows PuzzlesDaily challenges worth coming back forMondo Knows QuizzesDiscover something about yourselfMondo Knows ChallengesOne skill, tested in under a minuteMondo Knows FactsSurprising things, with the sourcesMondo Knows Internet ToolsCalculators and useful utilities

How Mondo works

Simple, honest, and fast.

Free, always

Every game, quiz and calculator is free to use. No account, no paywall, no locked results.

Explained, not just answered

Calculators show their formula and trivia shows why the answer is right.

Private by default

Games, quizzes and calculators run in your browser, so your scores and streaks are stored on your device, not on a server. Anonymous page-view analytics runs only if you allow it in the cookie banner.