Steam-25%
Idle Primes
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 ██████!
Casual
Overview
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 ██████!
Screenshots
Game information
- Developer
- ipip
- Publisher
- ipip
- Release date
- Nov 9, 2026
- Genres
- Casual
- Platforms
- Windows
- Languages
- English, French, Japanese, Korean, Portuguese - Brazil, Simplified Chinese, Spanish - Latin America, Italian
Updated Nov 9, 2026, 4:53 PM · Deal and price data provided by Steam