Games like Project Blue Book: Hidden Mysteries
Below are 24 hand-picked alternatives to Project Blue Book: Hidden Mysteries for fans of indie, adventure, casual, ranked by imho.run's hybrid recommender. Each pick is scored on three signals: collaborative filtering across millions of Steam libraries (which players who logged hours in Project Blue Book: Hidden Mysteries also play), content overlap on genres, categories, and storefront tags, and review-mined "vibe" embeddings that catch tonal similarity even when the genre label differs. Sections below cover closest matches, reviewer cross-mentions, cheaper alternatives, free-to-play picks. No login required — these picks work anchor-only.
About Project Blue Book: Hidden Mysteries: It’s 1952, and the U.S. Air Force is operating a top-secret investigation: Project Blue Book. As a newly recruited agent, it’s your job to uncover the truth behind these real declassified UFO sightings. Test your observation and investigation skills in this out-of-this-world hidden object adventure!
Players who liked Project Blue Book: Hidden Mysteries also play
Ranked by collaborative filtering across millions of Steam libraries plus content overlap on genres, tags, and developers.
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Enchanted Stories: Mystic Woods Collector's Edition
Top pick for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure and Casual with Project Blue Book: Hidden Mysteries.
The forest has eyes, and they’re on you! Embark on a quest to preserve an ancient woodland brimming with magical creatures and hidden objects!
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Surface: Virtual Detective Collector's Edition
Second-strongest match for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure and Casual with Project Blue Book: Hidden Mysteries.
Where are the missing players?
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Dark City: Paris Collector's Edition
Third-strongest match for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure and Casual with Project Blue Book: Hidden Mysteries.
The World Expo is coming to Paris!
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The House of Tesla: Definitive Edition
Ranked #4 for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure with Project Blue Book: Hidden Mysteries.
Solve intricate puzzles to activate Nikola Tesla's creations, restore Wardenclyffe Tower, and unlock hidden devices in his New York lab. Explore the Chicago World's Fair in this mind-bending puzzle adventure.
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Syberia: The World Before
Ranked #5 for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure with Project Blue Book: Hidden Mysteries.
Embark on a quest for identity through time, as you piece together the puzzle of two lives.
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60 Minutes to Extinction: Escape Room
Ranked #6 for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure and Casual with Project Blue Book: Hidden Mysteries.
You have exactly 60 minutes to save humanity from nuclear extinction. There are no second attempts. No manual saves. Explore a collapsing bunker, repair critical systems, and solve puzzles under pressure. Succeed or watch the world end.
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Mystery Case Files: Ravenhearst®
Ranked #7 for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Adventure and Casual with Project Blue Book: Hidden Mysteries.
Rumors surrounding the history of stately Ravenhearst Manor have circulated for decades. The recently acquired diary of Emma Ravenhearst may hold the key to unraveling the tale behind this unsettling place, yet the pages are missing.
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Detective Di: The Silk Rose Murders
Ranked #8 for Project Blue Book: Hidden Mysteries fans by collaborative filtering across millions of Steam libraries. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
A thrilling point-and-click adventure game where you play as Di Renjie, ancient China's most famous and gifted investigator, as he tracks a serial killer in the heart of the Tang Dynasty's capital city.
Cheaper alternatives
Games in the same vein priced at least 40% below Project Blue Book: Hidden Mysteries at current Steam store prices.
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POSTAL 2
Priced ~86% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
Live a week in the life of "The POSTAL Dude"; a hapless everyman just trying to check off some chores. Buying milk, returning an overdue library book, getting Gary Coleman's autograph, what could possibly go wrong?
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Buckshot Roulette
Priced ~57% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie with Project Blue Book: Hidden Mysteries.
Play Russian roulette with a 12-gauge shotgun. Four enter. One leaves. Roll the dice with your life. Good luck!
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GRIS
Priced ~46% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
Gris is a hopeful young girl lost in her own world, dealing with a painful experience in her life. Her journey through sorrow is manifested in her dress, which grants new abilities to better navigate her faded reality.
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The Test
Priced ~72% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
You will answer a series of questions that will reveal truths from deep within. These questions may make you uncomfortable, but with great knowledge comes great sacrifice. Can you make it all the way through The Test, and if you do, are you sure you want the answers you seek?
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Milk inside a bag of milk inside a bag of milk
Priced ~79% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
A short story about what sort of challenges everyday little things can be. Help the girl buy milk, be the first not to disappoint her.
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Blood and Bacon
Priced ~86% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Adventure and Casual with Project Blue Book: Hidden Mysteries.
This Co-op Shooter , has Day and Night levels, multiple maps, players will take on 25 enemy types and numerous bosses, like Gargantuan Monsters and Minibosses every 10 days as you explore, shoot and run for your life against the onslaught of porcine monstrosities.
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Crypt of the NecroDancer
Priced ~57% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie with Project Blue Book: Hidden Mysteries.
Crypt of the NecroDancer is an award winning hardcore roguelike rhythm game. Move to the music and deliver beatdowns to the beat! Groove to the epic Danny Baranowsky soundtrack, or select songs from your own MP3 collection!
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A Short Hike
Priced ~43% under Project Blue Book: Hidden Mysteries on Steam right now. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
Hike, climb, and soar through the peaceful mountainside landscapes of Hawk Peak Provincial Park as you make your way to the summit.
Free alternatives
Free-to-play games that recommended players of this title also tend to enjoy.
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Doki Doki Literature Club!
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Indie and Casual with Project Blue Book: Hidden Mysteries.
The Literature Club is full of cute girls! Will you write the way into their heart? This game is not suitable for children or those who are easily disturbed.
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Life is Strange - Episode 1
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Adventure with Project Blue Book: Hidden Mysteries.
Episode 1 now FREE! Life is Strange is an award-winning and critically acclaimed episodic adventure game that allows the player to rewind time and affect the past, present and future.
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Ultimate Custom Night
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Indie with Project Blue Book: Hidden Mysteries.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
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Bongo Cat
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Indie with Project Blue Book: Hidden Mysteries.
Bongo cat needs your help. Bongo cat needz more hatz!!! Every time you press a key, Bongo cat will punch your taskbar. Type, click, play, work to collect more points. Which hats will you find?
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ENA: Dream BBQ
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
Experience surreal environments and inexplicable characters as ENA in a new wild world.
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The Murder of Sonic the Hedgehog
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Indie and Casual with Project Blue Book: Hidden Mysteries.
Sonic the Hedgehog...was murdered!? Get to the bottom of the mystery in this brand-new adventure!
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Indigo Park: Chapter 1
Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Indie and Adventure with Project Blue Book: Hidden Mysteries.
Explore the abandoned childhood wonder of Indigo Park! Guided by Rambley the Raccoon, help restore power to the destroyed amusement park while you run from the reason it shut down.
Narrow it down
Head-to-head comparisons
Frequently asked about Project Blue Book: Hidden Mysteries
- How much does Project Blue Book: Hidden Mysteries cost?
- Project Blue Book: Hidden Mysteries is listed on Steam at 6.99 USD (current store price; Steam sales may reduce this temporarily).
- What games are most similar to Project Blue Book: Hidden Mysteries?
- Based on Steam play patterns and shared genres/tags, the games most often recommended alongside Project Blue Book: Hidden Mysteries are Enchanted Stories: Mystic Woods Collector's Edition, Surface: Virtual Detective Collector's Edition, Dark City: Paris Collector's Edition.
- Who developed Project Blue Book: Hidden Mysteries?
- Project Blue Book: Hidden Mysteries was developed by Three Gates and published by Legacy Games.
imho.run ranks Steam game alternatives using a mix of collaborative filtering (ALS / iALS / EASE / LightGCN), content scoring over genres, categories, Steam tags, developers, and publishers, plus AI-extracted vibes mined from review text. The page above is generated in seed mode anchored on Project Blue Book: Hidden Mysteries.
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