Single-player games like Biotoxin: The Dark Days
Below are 9 single-player Steam games similar to Biotoxin: The Dark Days, 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 Biotoxin: The Dark Days page.
Ranked picks
- 1
MYSTERY HOUSE : SECRET STEALTH
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
There are lots of exciting experiences and tasks waiting for you in the game. Do you like the tasks to be solved? Do you like excitement when someone is chasing you and you need to find the key to the mystery? Then this game is for you. We are continually developing and engaging in more and more puzzles and tasks.
- 2
Diary of Defender
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
Into the game, you will become a defender, return to the age of war, defense the enemy wave of attack.
- 3
Age Of Forays
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
Feel yourself in the role of warrior. Do raids, improve your ship, improve your hero, control your combat unit. Become a part of the great history of the northern kingdom
- 4
Lovestory
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
Lovestory is a hurricane shoot 'em up 3D shooter with a large range of weapons and a huge number of enemies. Help the hero to blow a path, gaining the upper hand lot of corpses and tons of twisted metal to save his love.
- 5
New Outbreak
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
New Outbreak is a 2D top-down zombie survival game. It allows you to survive how you want, build the things you want and take care of your companion.
- 6
Shrouded in Sanity: Freebirth
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
Free version of Shrouded in Sanity. Discover the secrets of the estate, as you look for answers among the violent inhabitants. Servants roaming the halls will attack on sight, for a strange and repelling madness took hold... one rooted in a deeper understanding of cosmic insignificance.
- 7
The Scrungeon Depths
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
The Scrungeon Depths is an over the top, ludicrously randomly generated rogue like madhouse. Wade through the body parts of defeated foes to crawl ever deeper and seek answers to the mysteries held within. Only the strong (and slightly insane) will survive.
- 8
Infested Nation
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
Infested Nation is a fast paced and brutal top down shooter. Outnumbered and outgunned, you will need to rely on your wits and reflexes to make it through each situation alive.
- 9
Dissimilation
Single-player alternative to Biotoxin: The Dark Days — playable solo, no multiplayer required. Shares Action and Indie with Biotoxin: The Dark Days.
Dissimilation is a top down, retro styled shooter set in a randomly generated galaxy. Dock at space stations, land and explore planets, upgrade your ship and shoot your way across the stars.