Gameplay:
- Investigate eerie clues and solve puzzles to uncover the bunker’s dark past.
- Battle otherworldly creatures rising from ocean depths.
- Scavenge resources to endure unrelenting horrors.

Features:
- Dual perspectives: Toggle between FPS and TPP anytime.
- 5 unique endings: Your decisions define the outcome.
- Immersive audio: Haunting soundscapes amplify the terror.
- Retro-modern fusion.
- Mental health system.

You have been sent to the island of Kanaan to find an abandoned research facility of the "Third Reich".

During the briefing, you received information that the facility was engaged in researching parallel dimensions and collecting information about ancient deities.

There are various legends about the island of Kanaan, some say that it was once inhabited by a tribe worshiping ancient sea deities. Others claim that the control over the island belonged to the fish people.

Four months earlier, tectonic tremors occurred throughout the archipelago, as a result of which tsunami waves rolled through the islands, but by some coincidence they missed Kanaan, but many of the buildings were damaged or collapsed.

Hydra is a detective game with survival horror elements. The main character's condition is described by three parameters: health, endurance and sanity. The player's task during the adventure is to keep these parameters at a decent level. Seth's character can die from the damage dealt, but he can also fall into madness. Endurance describes how long our character can run, parry blows or attack with melee weapons.

The player can use two different perspectives. From an isometric perspective, the hero can fight in contact using a melee weapon and also parry opponents' attacks. In first-person mode, we see what Seth sees through his eye implants. Seth was injured and lost his eyesight during one of his missions for the NML corporation. The corporation was "gracious" enough to provide him with the cheapest eye implants so that he could continue working for them. The implants have a night vision and environmental analysis mode that can mark useful elements of the environment.

During the investigation, we will find various useful items such as weapons, notes, food, medicines and utility items related to our task.

On our way, we will also encounter characters who may be able to provide us with helpful information or will be unfavorable towards us. The island of Kanaan is also a place where terrifying creatures come out of the dark sea.

The game has five ending variants, depending on the player's actions.