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!

Launch options

No player history yet. This app is now tracked, so data will appear within about ten minutes.

Regional prices

All Steam store regions, converted to USD at today's exchange rate, compared with the US price. Lowest is the lowest price SteamRaw has recorded for that region.

Price history, US store (USD)

Branches

Depots

A build is one published version of the game's files on a branch. Steam assigns a new build ID every time the developer pushes an update, so this list is the update history of the app. The files inside a build (depot manifests) are only readable with an account that owns the game, which SteamRaw does not have yet, so build contents are not shown.

Every appinfo change SteamRaw has observed, grouped by changelist. Tags, features, languages, builds, depots, prices and any other key Steam publishes. Tracking since 2026-09-11 21:35 UTC.

No changes recorded since SteamRaw first saw this app. Every future PICS change will be listed here.

No news for this app.

Full appinfo as delivered by Steam PICS, changenumber 35946306. Also at /api/app/1543990/raw.

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