Project Blue Book: Hidden Mysteries
| App ID | 1543990 |
| App Type | Game |
| Developer | Three Gates |
| Publisher | Legacy Games |
| Supported Systems | Windows |
| Technologies | Unity Engine |
| Last Changenumber | 27924129 |
| Last Record Update | 11 March 2025 – 23:04:22 UTC ( |
| Release Date | 15 March 2021 – 14:18:55 UTC ( |
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!
Steam price history
Current Price
$6.99
Lowest Recorded Price
$3.84 at -45%
14 March 2024
| Currency | Current Price | Converted Price | Lowest Recorded Price | ||
|---|---|---|---|---|---|
 U.S. Dollar |
$6.99 | $6.99 | $3.84 | $3.84 at -45% | |
 Russian Ruble |
175 ₽ | $2.10 | -69.90% | $1.15 | 96 ₽ at -45% |
 Kazakhstani Tenge |
1400₸ | $2.62 | -62.43% | $1.44 | 770₸ at -45% |
 Brazilian Real |
R$ 14,49 | $2.67 | -61.77% | $1.46 | R$ 7,96 at -45% |
 Indian Rupee |
₹ 259 | $2.93 | -57.96% | $1.61 | ₹ 142 at -45% |
 Ukrainian Hryvnia |
129₴ | $3.13 | -55.13% | $1.70 | 70₴ at -46% |
 Indonesian Rupiah |
Rp 52999 | $3.21 | -54.00% | $1.76 | Rp 29149 at -45% |
 South African Rand |
R 58.00 | $3.31 | -52.55% | $1.82 | R 31.90 at -45% |
 Colombian Peso |
COL$ 13490 | $3.39 | -51.48% | $1.86 | COL$ 7419 at -45% |
 Chilean Peso |
CLP$ 3300 | $3.39 | -51.37% | $1.86 | CLP$ 1815 at -45% |
 Vietnamese Dong |
90000₫ | $3.41 | -51.21% | $1.87 | 49500₫ at -45% |
 Philippine Peso |
₱219.95 | $3.85 | -44.78% | $2.12 | ₱120.97 at -45% |
 Chinese Yuan |
¥ 28 | $3.92 | -43.78% | $2.16 | ¥ 15.40 at -45% |
 South Asia - USD |
$3.99 | $3.99 | -42.92% | $2.19 | $2.19 at -45% |
 Uruguayan Peso |
$U165 | $4.12 | -40.94% | $2.25 | $U90 at -45% |
 Malaysian Ringgit |
RM17.50 | $4.15 | -40.55% | $2.28 | RM9.62 at -45% |
 Saudi Riyal |
15.95 SR | $4.25 | -39.18% | $2.33 | 8.77 SR at -45% |
 Thai Baht |
฿139.00 | $4.38 | -37.30% | $2.41 | ฿76.45 at -45% |
 Peruvian Sol |
S/.15.50 | $4.40 | -36.93% | $2.42 | S/.8.52 at -45% |
 Mexican Peso |
Mex$ 82.49 | $4.42 | -36.63% | $2.43 | Mex$ 45.36 at -45% |
 Taiwan Dollar |
NT$ 138 | $4.55 | -34.89% | $2.47 | NT$ 75 at -46% |
 CIS - U.S. Dollar |
$4.69 | $4.69 | -32.90% | $2.57 | $2.57 at -45% |
 Kuwaiti Dinar |
1.45 KD | $4.74 | -32.06% | $2.58 | 0.79 KD at -46% |
 Hong Kong Dollar |
HK$ 38.00 | $4.87 | -30.22% | $2.68 | HK$ 20.90 at -45% |
 Japanese Yen |
¥ 720 | $4.89 | -30.03% | $2.69 | ¥ 396 at -45% |
 Qatari Riyal |
17.99 QR | $4.94 | -29.32% | $2.71 | 9.89 QR at -45% |
 Norwegian Krone |
52,00 kr | $5.21 | -25.42% | $2.86 | 28,60 kr at -45% |
 New Zealand Dollar |
NZ$ 8.89 | $5.28 | -24.39% | $2.90 | NZ$ 4.88 at -45% |
 South Korean Won |
₩ 7500 | $5.40 | -22.74% | $2.96 | ₩ 4120 at -45% |
 U.A.E. Dirham |
21.00 AED | $5.71 | -18.19% | $3.14 | 11.55 AED at -45% |
 Canadian Dollar |
CDN$ 7.99 | $5.78 | -17.22% | $3.17 | CDN$ 4.39 at -45% |
 Singapore Dollar |
S$7.50 | $5.84 | -16.31% | $3.21 | S$4.12 at -45% |
 Costa Rican Colon |
₡3300 | $6.54 | -6.35% | $3.60 | ₡1815 at -45% |
 Australian Dollar |
A$ 9.95 | $6.57 | -5.96% | $3.61 | A$ 5.47 at -45% |
 Euro |
5,69€ | $6.68 | -4.33% | $3.66 | 3,12€ at -45% |
 LATAM - U.S. Dollar |
$6.99 | $6.99 | $3.84 | $3.84 at -45% | |
 MENA - U.S. Dollar |
$6.99 | $6.99 | $3.84 | $3.84 at -45% | |
 British Pound |
£5.19 | $7.04 | +0.72% | $3.86 | £2.85 at -45% |
 Polish Zloty |
25,49zł | $7.04 | +0.76% | $3.87 | 14,01zł at -45% |
 Israeli New Shekel |
₪25.95 | $7.78 | +11.39% | $4.28 | ₪14.27 at -45% |
 Swiss Franc |
CHF 7.25 | $9.13 | +30.68% | $5.01 | CHF 3.98 at -45% |
Valve suggested prices are shown on package pages.
Price history
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Additional Information
| Developer | Three Gates | |||||||||||||||
| community_visible_stats | Yes | |||||||||||||||
| ReleaseState | released | |||||||||||||||
| Publisher | Legacy Games | |||||||||||||||
| Store Release Date | 15 March 2021 – 14:19:04 UTC ( |
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| osarch | empty string | |||||||||||||||
| community_hub_visible | Yes | |||||||||||||||
| Primary Genre | Casual (4) | |||||||||||||||
| Store Genres | Adventure (25), Casual (4), Indie (23) | |||||||||||||||
| Steam Release Date | 15 March 2021 – 14:18:55 UTC ( |
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| Store Asset Modification Time | 4 March 2021 – 22:57:35 UTC ( |
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| library_assets |
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| osextended | empty string | |||||||||||||||
| Detected Technologies (?) | Unity Engine, UnityIL2CPP SDK | |||||||||||||||
| restricted_countries | DE Germany |
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| First seen on SteamDB | 2 February 2021 – 23:56:31 UTC ( |
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Supported Languages
| 1 Languages | Interface | Full Audio | Subtitles |
|---|---|---|---|
| English | Yes |
Assets
Load all asset images| clienticon | a0773887ed459ff6911e4df8961c63b831fe3205 | ||||||||||||||||||||||||||||||
| clienttga | 2a7db159c294cc6435086d608dbed05d5e06bb72 | ||||||||||||||||||||||||||||||
| icon | a47e9f3529c9e6237f6c8a036ee6b72461b068d9 | ||||||||||||||||||||||||||||||
| logo | 9ad624693bc5a946a3973aba89ae0160da6662c0 | ||||||||||||||||||||||||||||||
| logo_small | 9ad624693bc5a946a3973aba89ae0160da6662c0_thumb | ||||||||||||||||||||||||||||||
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