Single-player games like Oppcium
Below are 8 single-player Steam games similar to Oppcium, 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 Oppcium page.
Ranked picks
- 1
Alien AI
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Indie with Oppcium.
An Alien AI came to Earth 20 years ago. We believed it was the greatest event in human history. The Alien AI offered us all the knowledge and technology it had. All we had to do was to help it recover and give it resources. We did.. It took over the world and enslaved us. Help us shut it down.
- 2
Crysis
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action with Oppcium.
Adapt to Survive An epic story thrusts players into an ever-changing environment, forcing them to adapt their tactics and approach to conquer battlefields ranging from newly frozen jungle to zero-gravity alien environments. Suit up! A high-tech Nanosuit allows gamers to augment their abilities in real time on the battlefield.
- 3
Crysis Warhead®
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action with Oppcium.
Pulse-racing new installment from 2007's PC Game of the Year*: Play as Sergeant Sykes and experience a whole new side of the battle. A standard combat mission behind enemy lines becomes critical when you discover your enemies have captured something of vital importance to the ensuing war.
- 4
Species: Unknown
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action and Indie with Oppcium.
Species: Unknown is a 1 to 4 players co-op survival horror. Complete high-risk missions aboard an abandoned ship while being hunted by an unknown creature. Survive and upgrade your gear to face each new threat that lurks in the dark.
- 5
Deus Ex: Mankind Divided
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action with Oppcium.
You play as Adam Jensen, an experienced covert operative operating in a world that despises his kind: augmented humans. Choose from an arsenal of state-of-the-art weapons and augmentations to build your playstyle, and decide who you'll trust, to unravel a vast worldwide conspiracy.
- 6
Prey
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action with Oppcium.
In Prey, you awaken aboard Talos I, a space station orbiting the moon in the year 2032. You are the key subject of an experiment meant to alter humanity forever – but things have gone terribly wrong. The space station has been overrun by hostile aliens and you are now being hunted.
- 7
Crysis 2 - Maximum Edition
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action with Oppcium.
Aliens are decimating New York City, only you have the technology to survive. Be The Weapon.
- 8
ROOT
Single-player alternative to Oppcium — playable solo, no multiplayer required. Shares Action and Indie with Oppcium.
ROOT is a cyber espionage themed hardcore stealth FPS that lets you play it how you want: whether creeping along corridors undetected or bursting into rooms to blow away all adversaries. Cyber terrorism is a dangerous profession, and risks have real consequences.