About the Company

Zettanium was founded in 2014 and is an independent developer working in software and game development. The company creates games for both mobile and PC platforms.

About the Game

15th Prison

Our game was developed for the PC (Steam) platform. It is a psychological horror and puzzle-focused walking simulator that requires attention and reflexes. The game features a completely procedurally generated progression system, making replayability a key element. Built around anomalies, the game has a level-based structure with multiple endings possible depending on player choices.

15th Prison is a short horror anomaly-hunting experience set in a prison atmosphere, inspired by liminal spaces and psychological horror walking simulators like 'The Exit 8', 'Pools', and their virtual predecessor 'P.T.'.

Story and Gameplay:

You are trapped in a prison with endless blocks, housing the most dangerous criminals. This prison is notorious for horrific events. Observe your surroundings carefully to reach Block 15 and find your way out. Take the envelope from the guard at every block transition—these envelopes are crucial for your escape plan!

Do not ignore any anomaly.

Depending on how well you detect anomalies in the blocks, you will face different endings.

If you detect an anomaly, turn back immediately. Enter the door you came through.

If you don’t see any anomaly, don’t turn back. Move forward, take the envelope, and enter through the next door.

Some anomalies can lead to death. Unique experiences await you in 15th Prison.

When you reach Block 15, three different doors will await you. Each leads to a different ending. Choose any door you like. If you're observant and solve the final puzzle, you may be able to escape the prison.

Playtime: 20–90 minutes

Minimum System Requirements

• Requires a 64-bit processor and operating system
• OS *: Windows 7 / 8 / 10 / 11 - 64 bit
• Processor: Intel Core i3
• Memory: 4 GB RAM
• Graphics: NVIDIA GeForce GTX 650+
• DirectX: Version 10
• Storage: 2 GB available space