★Cashews grow on the outside of a fruit, not inside a shell.★The moon has moonquakes.★There is a village in Norway called 'Hell' that freezes over every winter.★The world's oldest known recipe is for beer.★Sloths can hold their breath longer than dolphins can.★Hippos can't actually swim, they walk along the riverbed.★Pigeons can recognize themselves in a mirror.★Humans share 60% of their DNA with bananas.★Your nose can remember 50,000 different scents.★A rhinoceros' horn is made of keratin, the same stuff as hair.★Bananas are curved because they grow towards the sun.★The smell of rain has a name: petrichor.★Pineapples take about two years to grow.★Cows have best friends and get stressed when separated.★Pigs can't look up at the sky without rolling over.★Elephants are the only mammals that can't jump.★The French language has 13 different words for 'kiss'.★Sharks existed on Earth before trees did.★The Great Wall of China is not visible from space with the naked eye.★A shrimp's heart is located in its head.★Sea otters hold hands while sleeping so they don't drift apart.★The Statue of Liberty was originally intended to be a lighthouse.★Ketchup was once sold as medicine in the 1830s.★The shortest commercial flight in the world lasts just 57 seconds.★The microwave oven was invented by accident when a researcher noticed a chocolate bar melted in his pocket.★The Eiffel Tower can grow up to 6 inches taller during summer.★Bubble wrap was originally invented as wallpaper.★Google processes more than 8.5 billion searches every single day.★Cotton candy was co-invented by a dentist.★Starfish can regenerate their lost limbs.★Scotland's national animal is the unicorn.★Cows have regional accents, they moo differently in different areas.★A group of pandas is called an embarrassment.★A newborn kangaroo is about the size of a jellybean.★There's a species of jellyfish that is immortal.★Dolphins sleep with one eye open.★Bees can recognize individual human faces.★Octopuses have three hearts and blue blood.★Voice actors for Mickey and Minnie Mouse got married in real life.★A hummingbird's heart can beat up to 1,260 times per minute.★There are more than 1,000 chemicals in a cup of coffee.★Humans blink about 15 to 20 times per minute.★In Switzerland it is illegal to own just one guinea pig.★Humans are the only animals that blush.★The Mona Lisa has no eyebrows or eyelashes.★Your tongue print is as unique as your fingerprint.★We have mapped more of Mars than of our own ocean floor.★Ancient Egyptians slept on stone pillows.★Avocados are toxic to most animals except humans.★A group of ferrets is called a business.★The average person walks the equivalent of three times around the world in a lifetime.★The longest recorded flight of a chicken lasted 13 seconds.★Koalas have fingerprints nearly identical to humans.★A group of flamingos is called a 'flamboyance'.★It takes about eight minutes for sunlight to reach Earth.★A jiffy is an actual unit of time: 1/100th of a second.★More than half of all people alive today have never made a phone call.★There are more possible iterations of a game of chess than atoms in the observable universe.★A group of crows mobbing a predator is literally called a 'murder patrol'.★Cats can't taste sweetness.★A blue whale's tongue can weigh as much as an elephant.★A day on Venus is longer than a year on Venus.★Antarctica is the only continent without native reptiles or snakes.★Sloths only poop about once a week.★A newborn panda is smaller than a mouse.★A cloud can weigh more than a million pounds.★Pteronophobia is the fear of being tickled by feathers.★Cleopatra lived closer in time to the Moon landing than to the building of the Great Pyramid.★Wombat poop is cube-shaped.★Butterflies taste with their feet.★Crows can recognize human faces and hold grudges for years.★A flock of crows is known as a murder.★Saturn would float if you could find an ocean big enough.★A day on Mercury lasts 59 Earth days.★Rats laugh when tickled.★Banging your head against a wall for one hour burns 150 calories.★Octopuses can taste with their arms.★Polar bears have black skin under their white fur.★The Hawaiian alphabet has only 13 letters.★An octopus has nine brains.★A day on Jupiter lasts only about 10 hours.★You can hear a blue whale's heartbeat from more than two miles away.★It is physically impossible to hum while holding your nose.★The oldest 'your mom' joke was discovered on a 3,500 year old Babylonian tablet.★The first oranges weren't orange, they were green.★A snail can sleep for three years straight.★Most 'silver' spoons are actually made of stainless steel.★A lion's roar can be heard from up to 5 miles away.★A group of jellyfish is called a smack.★Your stomach gets a new lining every 3 to 4 days, otherwise it would digest itself.★Honey never spoils. Archaeologists found 3000-year-old honey in Egyptian tombs that was still edible.★Horses physically cannot vomit.★Tigers have striped skin, not just striped fur.★Chewing gum while you chop onions helps keep you from crying.★So far, two diseases have successfully been eradicated: smallpox and rinderpest.★Peanuts aren't nuts, they are legumes.★The shortest war in history lasted 38 to 45 minutes between Britain and Zanzibar.★A 'moment' was medieval unit of time equal to 90 seconds.★Dolphins have names for each other.★7% of American adults believe that chocolate milk comes from brown cows.★The longest hiccuping spree lasted 68 years.★Dragonflies have been around for about 300 million years.★Sea cucumbers breathe through their butts.★A crocodile can't stick its tongue out.★A group of porcupines is called a prickle.★The fear of long words is ironically called hippopotomonstrosesquippedaliophobia.★A group of owls is called a parliament.★A blue whale's heart is roughly the size of a small car.★A bolt of lightning is five times hotter than the surface of the sun.★A hippo's sweat is pink.★If you lift a kangaroo's tail off the ground it can't hop.★The first computer mouse was made of wood.★The smell of freshly cut grass is actually a plant distress signal.★29th May is officially Put a Pillow on Your Fridge Day.★The average person spends six months of their life waiting for red lights to turn green.★Bananas are berries, but strawberries are not.★The first item ever sold on eBay was a broken laser pointer.★A mosquito has 47 teeth.★There are only two countries in the world whose names start with 'The': The Gambia and The Bahamas.★The inventor of the Pringles can is buried in one.★A snail can have up to 25,000 teeth on its tongue.★The 'new car smell' is made of dozens of chemicals off-gassing from the interior.★Ostriches can run faster than horses.★Hot water freezes faster than cold water. This is called the Mpemba effect.★There are more stars in the universe than grains of sand on every beach on Earth.★The Dutch were once the tallest people in the world.★Goldfish can recognize human faces.★Nintendo was founded in 1889 as a playing card company.★Snakes can help predict earthquakes.★Cherophobia is an irrational fear of fun or happiness.★The human brain uses about 20% of the body's total energy.★Vincent van Gogh only sold one painting during his lifetime.★The dot over the letter 'i' is called a tittle.★Barbie's full name is Barbara Millicent Roberts.★A group of frogs is called an army.★A 'jiffy' is one trillionth of a second in physics.

★Cashews grow on the outside of a fruit, not inside a shell.★The moon has moonquakes.★There is a village in Norway called 'Hell' that freezes over every winter.★The world's oldest known recipe is for beer.★Sloths can hold their breath longer than dolphins can.★Hippos can't actually swim, they walk along the riverbed.★Pigeons can recognize themselves in a mirror.★Humans share 60% of their DNA with bananas.★Your nose can remember 50,000 different scents.★A rhinoceros' horn is made of keratin, the same stuff as hair.★Bananas are curved because they grow towards the sun.★The smell of rain has a name: petrichor.★Pineapples take about two years to grow.★Cows have best friends and get stressed when separated.★Pigs can't look up at the sky without rolling over.★Elephants are the only mammals that can't jump.★The French language has 13 different words for 'kiss'.★Sharks existed on Earth before trees did.★The Great Wall of China is not visible from space with the naked eye.★A shrimp's heart is located in its head.★Sea otters hold hands while sleeping so they don't drift apart.★The Statue of Liberty was originally intended to be a lighthouse.★Ketchup was once sold as medicine in the 1830s.★The shortest commercial flight in the world lasts just 57 seconds.★The microwave oven was invented by accident when a researcher noticed a chocolate bar melted in his pocket.★The Eiffel Tower can grow up to 6 inches taller during summer.★Bubble wrap was originally invented as wallpaper.★Google processes more than 8.5 billion searches every single day.★Cotton candy was co-invented by a dentist.★Starfish can regenerate their lost limbs.★Scotland's national animal is the unicorn.★Cows have regional accents, they moo differently in different areas.★A group of pandas is called an embarrassment.★A newborn kangaroo is about the size of a jellybean.★There's a species of jellyfish that is immortal.★Dolphins sleep with one eye open.★Bees can recognize individual human faces.★Octopuses have three hearts and blue blood.★Voice actors for Mickey and Minnie Mouse got married in real life.★A hummingbird's heart can beat up to 1,260 times per minute.★There are more than 1,000 chemicals in a cup of coffee.★Humans blink about 15 to 20 times per minute.★In Switzerland it is illegal to own just one guinea pig.★Humans are the only animals that blush.★The Mona Lisa has no eyebrows or eyelashes.★Your tongue print is as unique as your fingerprint.★We have mapped more of Mars than of our own ocean floor.★Ancient Egyptians slept on stone pillows.★Avocados are toxic to most animals except humans.★A group of ferrets is called a business.★The average person walks the equivalent of three times around the world in a lifetime.★The longest recorded flight of a chicken lasted 13 seconds.★Koalas have fingerprints nearly identical to humans.★A group of flamingos is called a 'flamboyance'.★It takes about eight minutes for sunlight to reach Earth.★A jiffy is an actual unit of time: 1/100th of a second.★More than half of all people alive today have never made a phone call.★There are more possible iterations of a game of chess than atoms in the observable universe.★A group of crows mobbing a predator is literally called a 'murder patrol'.★Cats can't taste sweetness.★A blue whale's tongue can weigh as much as an elephant.★A day on Venus is longer than a year on Venus.★Antarctica is the only continent without native reptiles or snakes.★Sloths only poop about once a week.★A newborn panda is smaller than a mouse.★A cloud can weigh more than a million pounds.★Pteronophobia is the fear of being tickled by feathers.★Cleopatra lived closer in time to the Moon landing than to the building of the Great Pyramid.★Wombat poop is cube-shaped.★Butterflies taste with their feet.★Crows can recognize human faces and hold grudges for years.★A flock of crows is known as a murder.★Saturn would float if you could find an ocean big enough.★A day on Mercury lasts 59 Earth days.★Rats laugh when tickled.★Banging your head against a wall for one hour burns 150 calories.★Octopuses can taste with their arms.★Polar bears have black skin under their white fur.★The Hawaiian alphabet has only 13 letters.★An octopus has nine brains.★A day on Jupiter lasts only about 10 hours.★You can hear a blue whale's heartbeat from more than two miles away.★It is physically impossible to hum while holding your nose.★The oldest 'your mom' joke was discovered on a 3,500 year old Babylonian tablet.★The first oranges weren't orange, they were green.★A snail can sleep for three years straight.★Most 'silver' spoons are actually made of stainless steel.★A lion's roar can be heard from up to 5 miles away.★A group of jellyfish is called a smack.★Your stomach gets a new lining every 3 to 4 days, otherwise it would digest itself.★Honey never spoils. Archaeologists found 3000-year-old honey in Egyptian tombs that was still edible.★Horses physically cannot vomit.★Tigers have striped skin, not just striped fur.★Chewing gum while you chop onions helps keep you from crying.★So far, two diseases have successfully been eradicated: smallpox and rinderpest.★Peanuts aren't nuts, they are legumes.★The shortest war in history lasted 38 to 45 minutes between Britain and Zanzibar.★A 'moment' was medieval unit of time equal to 90 seconds.★Dolphins have names for each other.★7% of American adults believe that chocolate milk comes from brown cows.★The longest hiccuping spree lasted 68 years.★Dragonflies have been around for about 300 million years.★Sea cucumbers breathe through their butts.★A crocodile can't stick its tongue out.★A group of porcupines is called a prickle.★The fear of long words is ironically called hippopotomonstrosesquippedaliophobia.★A group of owls is called a parliament.★A blue whale's heart is roughly the size of a small car.★A bolt of lightning is five times hotter than the surface of the sun.★A hippo's sweat is pink.★If you lift a kangaroo's tail off the ground it can't hop.★The first computer mouse was made of wood.★The smell of freshly cut grass is actually a plant distress signal.★29th May is officially Put a Pillow on Your Fridge Day.★The average person spends six months of their life waiting for red lights to turn green.★Bananas are berries, but strawberries are not.★The first item ever sold on eBay was a broken laser pointer.★A mosquito has 47 teeth.★There are only two countries in the world whose names start with 'The': The Gambia and The Bahamas.★The inventor of the Pringles can is buried in one.★A snail can have up to 25,000 teeth on its tongue.★The 'new car smell' is made of dozens of chemicals off-gassing from the interior.★Ostriches can run faster than horses.★Hot water freezes faster than cold water. This is called the Mpemba effect.★There are more stars in the universe than grains of sand on every beach on Earth.★The Dutch were once the tallest people in the world.★Goldfish can recognize human faces.★Nintendo was founded in 1889 as a playing card company.★Snakes can help predict earthquakes.★Cherophobia is an irrational fear of fun or happiness.★The human brain uses about 20% of the body's total energy.★Vincent van Gogh only sold one painting during his lifetime.★The dot over the letter 'i' is called a tittle.★Barbie's full name is Barbara Millicent Roberts.★A group of frogs is called an army.★A 'jiffy' is one trillionth of a second in physics.

Planet manager

Harmony

55

Cycle

0

Best

55

A wobbly kind of peace. Nobody is erupting, which counts as a win.

Cycle 0 · pick who gets your attention next

Planet log

A tiny planet spins into view. It already has complaints.

How to play Planet manager

Your planet is tiny but its features have enormous personalities. The moon is cranky about the tides, the clouds rain sarcastically, the volcano turns everything into theatre and the mountains stand exactly where nobody wants them. Each cycle you give one feature your full attention, which lifts its mood, while everything you ignore quietly sulks a few points lower. Then a random cosmic event lands: an aurora cheers everyone up, a comet snubs the moon, a satellite takes an unflattering photo. Watch the mood bars, read the log and keep the overall harmony score up. Your planet is saved in your browser, so it keeps its grudges between visits.

Tips

Rotate your attention, neglect adds up faster than you think
One feature in the red drags the whole harmony average down
Cosmic events are random, do not take a bad Monday personally
Harmony above 75 is genuinely hard, screenshot it when it happens

About Planet manager

Planet manager is a small caretaking sim about keeping four celestial drama queens on speaking terms. There is no losing and no timer, just a planet that responds to your choices with mood bars and increasingly specific complaints. The writing does the heavy lifting: every feature reacts to attention in its own voice, and the event log fills up with things like the volcano rebranding its ash as glitter or the mountains losing an argument with their own echo. It plays in short visits. Come by, run a few cycles, nudge harmony up a little, leave. The planet saves itself and will absolutely remember how long you were gone. Good for unwinding, bad for people who need to be liked by fictional moons.

More sandbox games

Critter cuddler: Pat puppies, kittens & friends. Build a tiny critter empire.
Liquid lab: Sandbox of glowing fluid. Bend gravity, light & color, splash with your finger.
Pixel painter: A tiny pixel canvas. Paint, save, screenshot, share with friends.
Game of life: Conway's classic cellular automaton. Watch patterns evolve.
Sand sandbox: Drop sand, water, stone, wood, plants and fire, then watch them interact.
Curve weaver: Draw glowing roulette curves. Save your art as a PNG.

Browse the full arcade →

00:00Warming up

0Pixels scrolled

0.0cmMouse odyssey

0Clicks made

0.00Calories burned

Got feedback or a site to suggest?

Spotted a broken link, found a hidden gem, or have an idea? We'd love to hear from you.