A Cursed Incremental Horror Game About Prime-number Obsession

ipip today announced that the demo for Idle Primes, a horror incremental game about discovering prime numbers across expanding grids, is now available on Steam.

In Idle Primes, players begin with one simple instruction: click the primes.

Each discovered prime becomes currency, allowing players to buy upgrades, unlock automation systems, and develop increasingly strange methods for searching the grid. What starts as a clean number-clicking game gradually mutates into something larger, faster, and more unsettling.

Idle Primes blends satisfying incremental progression, minimalist interaction, mathematical discovery, and a creeping retro-futuristic horror atmosphere. The demo supports English, Spanish, Japanese, Korean, Simplified Chinese, Portuguese, and French.

Key features

  • Search for prime numbers across dynamic number grids.
  • Unlock automation systems and powerful upgrades.
  • Discover new mechanics that change how primes are found.
  • Satisfying incremental progression with retro-futuristic vibes.
  • β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ Belphegor’s β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆ.
  • Localized demo support: playable in English, Spanish, Japanese, Korean, Simplified Chinese, Portuguese, and French.