Monstarium

A terrarium that lives on your desktop

Monstarium sits along the bottom of your screen, on top of your other windows, and stays out of the way. Clicks go straight through to whatever is behind it. Only the monsters themselves catch your mouse.

They don't stay put

Monsters wander off the strip and climb on top of your open windows. Move a window and they tumble back down.

Hatch, merge, evolve

Buy an egg, wait a minute, meet someone new. Drag a monster onto its twin and the two become something bigger. There are 37 evolution lines, 95 forms and 5 biomes to open, with new species turning up every day of your first week.

Collect every look

Each form comes in 4 colors and 6 rare variants: crystal, autumn, spotted, starry, rainbow and one that belongs to its biome. Rebirth a biome and its forms unlock a golden look too. That adds up to over 1,000 looks. A built-in guarantee means you are never stuck hunting the last one forever.

They have a life of their own

• Pet them, drop a treat and watch the race, or throw the ball around.
  
• Monsters that play together become best friends.
  
• Grant their little wishes and they earn stars of affection.
  
• Open a monster's diary, give it a name, or take it for a walk on a leash.
  
• Dress them up with 21 hats. Some you buy, some come with an achievement, and four only show up during seasonal events.
  
• Send a team from the box on an expedition and see what they bring back.
  
• Birthday hats, Christmas caps, real seasons, a rare golden visitor, hide and seek, and a few secrets.

Idle for real

Nobody starves and nobody dies. Nothing piles up while you are busy. Leave it alone for a week and your monsters are still there, glad to see you.

Seasons and friends

Halloween, Christmas, Lunar New Year and Easter come back every year with their own decorations, a hat and egg colors you only find then. Miss one and nothing is lost: those looks are a bonus and never needed to finish anything. Invite a Steam friend and three of your monsters go visit their screen while three of theirs walk on yours.

A companion for work and study

Pick a favorite to live in the corner of your screen. Feed it, play with it, and it keeps you company: it reminds you to drink water, naps through your focus sessions and cheers when you finish. It never gets sick. It just misses you. If you like, hide the strip and keep only your companion.

Focus with them

Set a focus timer from 15 to 90 minutes and keep a short to-do list next to it. Monstarium counts your focus minutes for the day and the week, and when you finish a task a monster cheers. Mix rain, fireplace, birds, stream, night and ocean sounds at whatever volume helps you work.

Made for the background

Monstarium earns coins while it is closed and goes to sleep when you step away. On our test PC it uses about 1% of the CPU, and a low-power mode cuts that further on laptops. It never reads your keyboard or what you type in other programs, and there is no store inside the game: buy it once and everything is yours.

For streamers

A green screen mode for OBS and an optional Twitch hookup. Viewers type !monster and a name in chat to name one of your monsters.

Features

• Always on top, with full click-through
  
• A strip along the bottom or a column of floors on the side of the screen
  
• Over 1,000 looks to collect, 21 hats and 73 achievements
  
• Seasonal events every year and friend visits through Steam
  
• Focus timer, to-do list and ambient sounds
  
• Real daylight, seasons and optional real weather for your city
  
• Low-power mode, adjustable opacity and a hotkey to move it to another monitor
  
• 10 languages: English, Portuguese, Spanish, German, French, Polish, Russian, Simplified Chinese, Japanese and Korean
  
• Progress while the game is closed, cloud saves and daily backups
  
• No account, no marketplace items, no battle pass, no tracking. Buy it once and it is yours