Boo! is a 2.5D side-scrolling shoot 'em up platformer set in a vibrant cartoon world… that’s slowly being devoured by a green apocalypse.
This is a dark and mysterious tale about a city under siege by monstrous plants. No one knows where they came from, or why they’re attacking. But when Matt’s best friend Emma is taken during the chaos, his search for her will uncover something far worse than overgrown vines.
You are Matt, a tired plumber caught in the middle of the green apocalypse. Armed with a stolen blaster and his trusty plumber’s plunger, Matt must battle through hordes of mutated plant creatures, survive deadly boss encounters, and uncover the truth behind the outbreak. Along the way, a shadowy figure offers strange upgrades — blaster modules that the player assembles and customizes to match their combat style.
Every encounter brings you closer to a horrifying realization: the plants didn’t rise by accident. Someone is behind it all… and he’s watching you.
Shoot 'em up with deck-building
Your blaster is modular — each component alters its behaviour, from damage type to shot pattern. Combine modules to match your style and adapt to every enemy.
Explore a living, infected world
An open, interwoven world invites deep exploration. Unlock new abilities and return to previously unreachable areas.
Unique Bosses & Enemies
Every boss and enemy is a challenge, with complex mechanics and memorable designs. Expect frustration — and satisfaction — when you finally win.
Hand-drawn cartoon style
Inspired by 1930s–1950s animation: fluid movement, expressive characters, and nostalgic charm hiding real danger.
Features
2.5D platforming with intense shoot 'em up combat
Dozens of unique enemies and tough bosses
Vintage cartoon visuals with a dark twist
No mercy. No shortcuts. Just roots, bullets, and skill
Add to your wishlist if you love cartoon art and hardcore challenge!
Where to buy a cheap Boo! - The Mystery Story Steam key?
Boo! - The Mystery Story is free to play! Download it on Steam and start playing instantly.
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What is the latest Boo! - The Mystery Story Steam price?
Boo! - The Mystery Story is completely free on Steam. No purchase needed - just download and play. If you are looking for premium DLC or in-game items, check the offers table above.
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Boo! - The Mystery Story PC sale & discount - all in one place
Our price tracker covers both official retailers and key marketplaces, so you can find Boo! - The Mystery Story on sale even outside seasonal promotions. We currently detect 0 active offers from official stores and keyshops. Check the table above, compare against the historical low, and set an alert so you never miss the next price drop.
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Does Boo! - The Mystery Story have GeForce NOW support?
Based on our data, Boo! - The Mystery Story is not currently available on GeForce NOW. You will need to run it locally on your PC. Browse games available on GeForce NOW.
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Can I buy Boo! - The Mystery Story on Steam?
Yes. Boo! - The Mystery Story has an official page on the Steam Store, but we currently don't track any third-party offers with Steam DRM. Check back later or set a price alert.
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Can I play Boo! - The Mystery Story on Steam Deck?
Not at this time. Valve marks Boo! - The Mystery Story as Unsupported on Steam Deck. Keep an eye on XD.deals - we track Proton updates and community fixes. Browse games that are Steam Deck Verified or Steam Deck Playable.
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Is Boo! - The Mystery Story on PC Game Pass or other subscriptions?
Boo! - The Mystery Story does not appear to be available on PC Game Pass, EA Play, Ubisoft+ or any other PC subscription service at this time. Your only option is purchasing the game - use XD.deals to find the best price.
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