Game
App 4765880
Idle Primes
ipip · released Nov 9, 2026
A cursed incremental horror game with PSX-style graphics. Find a strange CD-ROM, boot it on your bedroom computer, and click prime numbers to buy upgrades and automate the search, while something on the other side of the screen takes an interest in you. ████████████████████ Belphegor's ██████!
Price
-25%$2.99
$3.99
Reviews
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no reviews yet
Playing now
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not sampled yet
24h peak
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all-time seen —
Followers
—
Steam community hub
Owners (est.)
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from review count
YouTube activity
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videos · 30 d—
creators—
views · 1 yTwitch activity
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avg viewers · 30 d—
hours watched · 30 d—
streamers · 30 dProduct info
from Steam's PICS · read 3d ago- Change number
- 40,797,805 · seen 3d ago
- Public build
- 26,568,447 · Nov 10, 2026 (3d ago)
- Operating systems
- windows
- Architecture
- 64-bit
- Install size
- 411 MB · 158 MB download
- Install folder
Idle Primes- Controller support
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- Metacritic
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- Homepage
- —
- Release state
- released
- Community
- hub
Steam Deck
UnknownNo Deck test results published.
Branches · 1
every build Steam serves for this app| Branch | Build | Updated | Description |
|---|---|---|---|
| public | 26,568,447 | Nov 10, 2026 · 3d ago |
Build history
every build id we have seen on a branch (history starts with our first read)| Build | Branch | Released | First seen |
|---|---|---|---|
| 26,568,447 | public | Nov 10, 2026 15:01 | 3d ago |
| 26,248,130 | public | Oct 27, 2026 16:09 | 3d ago |
Depots · 2
content of the public branchLaunch options · 1
| Executable | OS | Description |
|---|---|---|
Idle Primes.exe |
windows 64-bit |
Languages · 8
| Language | Interface | Full audio | Subtitles |
|---|---|---|---|
| Spanish - Latin America | ✓ | — | ✓ |
| French | ✓ | — | ✓ |
| English | ✓ | — | ✓ |
| Italian | ✓ | — | ✓ |
| Korean | ✓ | — | ✓ |
| Japanese | ✓ | — | ✓ |
| Simplified Chinese | ✓ | — | ✓ |
| Portuguese - Brazil | ✓ | — | ✓ |
Packages · 1
all packages| Sub | Name | Billing | Price |
|---|---|---|---|
| 1657271 | Idle Primes | Store or CD key | -25%$2.99 |
Bundles · 0
all bundlesNot part of any bundle we know.
Change numbers
all changes#40,797,805 · 3d ago
Updates · patch notes
Steam announcements tagged as patch notes, linked to the public build they followed
No patch notes seen yet for this game.