A space puzzle app for kids aged 3 to 13

Put the sky together, one world at a time.

Kids drag planets, moons, stars and spacecraft to their place on seven space maps. Each one says its name out loud and tells a short, true story.

Get the appSee what Pro adds

All seven maps are free. Pro has a 7-day free trial. No ads, no accounts, works offline.

The Space Wiki app: the Solar System map, half filled, with Jupiter waiting to be dragged.
IThe Solar System, half done. Jupiter is waiting for its place.

Seven space maps, all free

94 things to find: planets, moons, seas on the Moon, places on Mars, star patterns and spacecraft. Every map stays free. No taster, no time limit.

  • Solar System
  • Moons
  • Small worlds
  • The Moon
  • Mars
  • Constellations
  • Spacecraft
  1. Pick a mapStart with the Solar System, or go straight to the Moon, Mars or the stars.
  2. Drag and listenEach picture says its name out loud, so kids who can't read yet can play on their own.
  3. A miss is a storyA wrong drop is never a fail. Space Wiki says what it was, then tells the story of the right one.

Meet the planets

Every world in Space Wiki has a short, true story, written for kids and checked against NASA's facts. Here are the eight planets, in order from the Sun.

MercuryThe smallest planet and the closest to the Sun. A year here lasts only 88 days.
VenusThe hottest planet of all, wrapped in thick yellow clouds. It spins backwards, so the Sun rises in the west.
EarthOur home. The only place we know that has life, and most of it is covered by oceans.
MarsThe red planet. Its red colour is rust in the dust, and it has the tallest volcano we know.
JupiterThe biggest planet. Its Great Red Spot is a storm wider than Earth that has blown for more than 150 years.
SaturnThe planet with the great rings. They are made of billions of pieces of ice and rock.
UranusIt rolls around the Sun tipped over on its side, like a ball.
NeptuneThe farthest planet, deep blue and very cold. It has the fastest winds in the solar system.

Play right here

Two small games from Space Wiki, free in your browser. No app needed.

Closest to the Sun first

Tap the planets in order. Start with the one next to the Sun.

    Surprise trivia

    Space Wiki Pro: 20 extras

    When every map is full, there is more to explore. One payment opens all 20 extras and everything we add later. Try them free for 7 days first.

    €9.99, paid once

    Explore deeper

    1. Famous starsDrag each bright star to its constellation.
    2. Space passportA stamp and a fact card for everything you have found.
    3. Mystery shapesSpacecraft and odd-shaped worlds in black. Who is it?
    4. Line them upPut planets, moons and spacecraft in the right order.
    5. Space tripHow long would it take by car, by plane or by rocket?
    6. True sizePut worlds side by side and see how big they really are.
    7. Moon tonightWhat does the Moon look like today, and next week?
    8. Moon jumpHow high could you jump on the Moon, on Mars or on Pluto?
    9. Match the worldRings, volcanoes and footprints: put each one on its world.

    Play & quiz

    1. Surprise trivia10 quick questions and a family leaderboard.
    2. Planet or moon?Planet, moon, dwarf planet, spacecraft or star pattern? Sort each one.
    3. Tricky onesThe ones you miss come back until they stick.
    4. Riddle huntClues, one at a time. Who am I?
    5. Sibling duelTwo players, one tablet. Fastest finger wins.
    6. Planet builderPick colours, stripes and rings to make a real world, or invent your own.
    7. Colouring bookColour the Moon, Mars and a rocket with your finger.

    Family & calm

    1. Kid profilesUp to 6 kids, each with their own progress.
    2. Grown-up cornerWhat each kid knows, and a certificate.
    3. Our family in spaceHow old would everyone be on Mars or on Jupiter?
    4. BedtimeOne calm space story before sleep.
    Screenshot of the Space Wiki app: Jupiter is 11 times as wide as Earth
    IIJupiter is 11 times as wide as Earth
    Screenshot of the Space Wiki app: What the Moon looks like tonight
    IIIWhat the Moon looks like tonight
    Screenshot of the Space Wiki app: Find the famous stars
    IVFind the famous stars
    Screenshot of the Space Wiki app: A stamp for everything you find
    VA stamp for everything you find
    Screenshot of the Space Wiki app: Two players, one tablet
    VITwo players, one tablet
    Screenshot of the Space Wiki app: How old would you be on Mars?
    VIIHow old would you be on Mars?

    Why it works

    Finding beats reading

    Each drag is a small memory test: find it, place it, check it. Pulling an answer out of your own head is called retrieval practice. Studies in real primary school classes show it works better than reading again.1

    A picture and a story

    Kids remember a picture with a short story far better than a list of facts. That is why every world comes with both.2

    No ads, ever

    A University of Michigan study found ads in 95% of 135 popular apps for children aged 5 and under. Space Wiki has none, and nothing to keep kids hooked.3

    Facts that hold up

    Sizes, distances and years come from NASA's planetary fact sheets. Space keeps surprising us, so when scientists find something new, we update it.4

    Calm for a 3 year old, still fun at 13.

    Made for kids who learn in their own way, including kids with ADHD.

    Short roundsSix pictures, then a small celebration. Easy to finish.
    Nothing to loseNo timers, no lives, no scores that go down. Every round leaves the map a bit fuller.
    Help in one tapThe lightbulb makes the right place glow. After two misses it also names what is next to it.
    Grows with your kidBig targets for the youngest, maps without outlines for the experts.
    1. Retrieval practice in primary schools: PMC12372469
    2. Pictures and dual coding (Paivio): The Learning Scientists
    3. Advertising in kids' apps, Meyer et al.: Michigan Medicine
    4. NASA planetary fact sheets: NASA NSSDCA

    Get Space Wiki

    The game is free: all seven maps and all 94 things to find. Pro is €9.99, once, after a 7-day free trial.

    • Free: all seven space maps with 94 things to find
    • Pro: all 20 extras and everything we add later
    • No subscription, no ads, nothing else to buy
    Coming soon to Google PlayComing soon to the App Store

    For grown-ups

    • No ads and no tracking. Ever.
    • No accounts. A kid profile is just a first name, kept on your own device.
    • A grown-up check comes first, so kids never see legal text or a buy button.
    • Works offline. In the car, on a plane, at grandma's.
    • Short, true space stories written for kids, with nothing scary in them.