Underplayed Gems

15th Prison (2025)

15th Prison cover
Developer
Zettanium
Platforms
Windows
Genres
Action, Adventure, Indie, Simulation
Rating
4.7 of 5, 33 player ratings
Typical playtime
about 59 minutes
Where to get it
Steam

How it feels

You methodically explore a grim prison, collecting envelopes and solving puzzles under a looming sense of dread.

atmospherictensepacingexplorationpuzzle-filledhorrormysteriousprocedural

What players say

Players describe this as a tense anomaly-spotting game set in a prison, harder than many in the genre. It is short, around two hours, with a final puzzle and some jumpscares. Movement feels a bit janky, and the game is very quiet. Reviews agree it is addictive and frustrating.

Trailer

Screenshots

15th Prison screenshot 115th Prison screenshot 215th Prison screenshot 315th Prison screenshot 415th Prison screenshot 515th Prison screenshot 6

More games like this

This page is from Underplayed Gems, a catalog of older and overlooked games. Not quite it? Tell the Catbot what you feel like playing and it picks from the whole catalog, or browse by platform and genre.