Boo! is a 2.5D cartoon-style platformer with shoot 'em up action and hardcore combat. Explore a plant-infested world, collect blaster modules, battle unique bosses, and uncover the city's secrets in a world inspired by vintage animation and hidden dangers.

<picture><source srcset="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/4d11667d9fa27828a2119a8fc1e642ba.webp?t=1764235514"><img src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/4d11667d9fa27828a2119a8fc1e642ba.poster.avif?t=1764235514" class="bb_img" width=512 height=256 /></picture>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. <h2 class="bb_tag" >Shoot 'em up with deck-building</h2>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.<h2 class="bb_tag" ><picture><source srcset="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/eea60cffcfaf33aa1608fe20470baff5.apng?t=1764235514"><img src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/eea60cffcfaf33aa1608fe20470baff5.poster.avif?t=1764235514" class="bb_img" /></picture> Explore a living, infected world</h2>An open, interwoven world invites deep exploration. Unlock new abilities and return to previously unreachable areas.<img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/732a399c437b8d3262cd3b85ce6d5e1d.avif?t=1764235514" width=512 height=256 /><h2 class="bb_tag" >Unique Bosses &amp; Enemies</h2>Every boss and enemy is a challenge, with complex mechanics and memorable designs. Expect frustration — and satisfaction — when you finally win.<h2 class="bb_tag" ><picture><source srcset="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/18b6333ceb10b0295d8926ae193b5a11.webp?t=1764235514"><img src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/18b6333ceb10b0295d8926ae193b5a11.poster.avif?t=1764235514" class="bb_img" width=512 height=256 /></picture> Hand-drawn cartoon style</h2>Inspired by 1930s–1950s animation: fluid movement, expressive characters, and nostalgic charm hiding real danger. <picture><source srcset="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/c419eb8dbcbe62eb4ca65bfdf7aa47b6.apng?t=1764235514"><img src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/c419eb8dbcbe62eb4ca65bfdf7aa47b6.poster.avif?t=1764235514" class="bb_img" /></picture><h2 class="bb_tag" >Features</h2><ul class="bb_ul"><li>2.5D platforming with intense shoot 'em up combat</li><li>Dozens of unique enemies and tough bosses</li><li>Vintage cartoon visuals with a dark twist</li><li>No mercy. No shortcuts. Just roots, bullets, and skill</li></ul>Add to your wishlist if you love cartoon art and hardcore challenge!<picture><source srcset="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/e5f5c638199e2ccf797b714860cee815.apng?t=1764235514"><img src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/1988980/extras/e5f5c638199e2ccf797b714860cee815.poster.avif?t=1764235514" class="bb_img" /></picture>

Good Game Database

Boo! - The Mystery Story Achievements