Steam
BestOfficialIn stockProject Blue Book: Hidden Mysteries · Region US · Jul 15
$6.99
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!
OfficialMar 15, 2021 · Three GatesAdventureCasualIndieFamily SharingSingle-playerWindows
Current best
$6.99
at Steam · Jul 15
All-time low
$4.19
Jul 9, 2026
Stores tracked
1
sources indexed
Review signal
67%
6 reviews
Current best · Steam
$6.99
Observed Jul 15
View best listingObserved low target
$4.19 · based on the previous indexed low
KeyDwarf only tracks observations — checkout happens on the store.
Tracked Stores
Best indexed price $6.99 at Steam.
1/1
View listing
How trust is scored: KeyDwarf combines source type, known retailer posture, marketplace risk, activation-region warnings, and source transparency. Checkout and support still happen with the external seller.
Price History
2 observationsBest observed priceAll-time low
All-time low
$4.19
Jul 9, 2026 · Steam
12-week avg
$5.59
2 recent observations
Current vs low
+67%
Current $6.99
Recommendation
Watch for drop
consider setting an alert
Lowest indexed daily price per currency. KeyDwarf tracks listings and does not sell keys.
Media
12 indexedCommon Questions
Where is Project Blue Book: Hidden Mysteries cheapest right now?
Project Blue Book: Hidden Mysteries is currently indexed at $6.99 from Steam. Publisher, direct storefront, or authorized retail source. Check the linked store's current terms before acting.
What is the historical low for Project Blue Book: Hidden Mysteries?
The indexed low for Project Blue Book: Hidden Mysteries is $4.19 from Steam, observed Jul 9, 2026. The current indexed price is 67% above that low, so KeyDwarf labels it "Watch for drop".
Is the top source safe?
Steam is labeled "Official store" in the index. KeyDwarf tracks the listing and source risk, but checkout and support stay with the external store.
What is the review signal?
Project Blue Book: Hidden Mysteries has a best indexed review signal of 67%.
Can KeyDwarf notify me about a lower price?
Use the alert target control on this page to save a watch target after sign-in.