Single-player games like Hydra - Poseidon's conspiracy
Below are 15 single-player Steam games similar to Hydra - Poseidon's conspiracy, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Hydra - Poseidon's conspiracy page.
Ranked picks
- 1
The Order of the Snake Scale
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
Inspired by Lovecraft, a psychological survival horror game set in a dystopian, alternative universe. Discover the mystery of the woman's death and learn the dark secrets of the Happy Rock. Are you ready?
- 2
Deep Sheol
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
In a dystopian future, Agent Seth investigates a corporate geological facility where a biological gas turned people into bloodthirsty monsters. Fight through enemy hordes, uncover a dark corporate conspiracy, and face Lovecraftian nightmares in this tense retro FPS with survival horror!
- 3
Mark of the Deep
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
Shipwrecked on a myth-shrouded island, play as rookie pirate Marcus “Rookie” Ramsey and explore haunting biomes, face unforgiving combat, and unravel a deep-sea curse in search of your lost crew, the Angry Mermaids.
- 4
Dark Light
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
Dark Light is a post-apocalyptic cyberpunk action-platformer with intense hack'n slash combat. Explore the unknown, enhance your abilities with cyberwares, and face off against supernatural entities to seal the Dark Void and end the eternal darkness.
- 5
Still Wakes the Deep
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
1975. Disaster strikes the Beira D oil rig off the coast of Scotland. Navigate the collapsing rig to save your crew from an otherworldly horror on the edge of all logic and reality in this 3x BAFTA Games Award-winning narrative horror experience.
- 6
Kingsgrave
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
Welcome to Kingsgrave, a dark fantasy adventure RPG. Gain more power and obtain new combat skills as you explore the fractured land, slay foes created by plague, solve puzzles and rebuild villages. Reclaim your realm!
- 7
The Darkest Tales
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
When a nightmare creeps into reality, the only ones that can help are those whose magical powers we’ve believed in since childhood. A brave teddy bear heads to the far side of “happily ever after” to rescue his owner, Alicia.
- 8
![The Eternal Castle [REMASTERED] — Steam game cover](https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/963450/header.jpg?t=1667004057)
The Eternal Castle [REMASTERED]
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
The Eternal Castle [REMASTERED] is a remake of the original "ETERNAL CASTLE" from 1987, with additional game mechanics, sophisticated sound design, polished 2-bit CGA animated graphics, and modernized game design.
- 9
Ignatius
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Adventure with Hydra - Poseidon's conspiracy.
Ignatius is a atmospheric puzzle-platformer game with an interesting story. The game with its visual form and plot refers to the old silent movies.
- 10
Theofil
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Adventure with Hydra - Poseidon's conspiracy.
Theofil is an action arcade game in which you'll guide a hooded hero wearing an ancient robe. Your weapon is a magical wooden staff that brave Theofil uses to destroy his enemies. His abilities will help you fight against dangerous enemies.
- 11
Magnus Imago
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Adventure with Hydra - Poseidon's conspiracy.
Magnus Imago is an atmospheric journey through a mysterious world of characters, traces and symbols. The task of the player is to solve the puzzles, using proper combinations of objects, finding them in the environment around him.
- 12
Dick Ranger
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action and Adventure with Hydra - Poseidon's conspiracy.
Experience an amazing adventure with Dick Ranger, who set off in search of his lost father William, a valued explorer and anthropologist. Travel with the hero through different lands and places.
- 13
Magnus Positive Phototaxis
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Adventure with Hydra - Poseidon's conspiracy.
Magnus Positive Phototaxis is an atmospheric journey through a mysterious world of characters, traces and symbols. The task of the player is to solve the puzzles, using proper combinations of objects, finding them in the environment around him.
- 14
Mage Ball
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Action with Hydra - Poseidon's conspiracy.
Explore extraordinary magical dimensions in 3D graphics. Avoid traps, chasms, collect magic potions and solve puzzles. Find your way out by jumping on asteroid belts, moving platforms, rolling through tunnels and slides, using magical portals. Prove you're not the worst mage in the guild.
- 15
Lazarus A.D. 2222
Single-player alternative to Hydra - Poseidon's conspiracy — playable solo, no multiplayer required. Shares Adventure with Hydra - Poseidon's conspiracy.
The final part of the Sons of Welder game series, set in a dystopian universe, which uniquely combines games from the Magnus series. A game that you can experience on two levels. Hand-drawn motion comics. A metaphorical journey into oneself. A mystical experience with a touch of good humor.