Single-player games like Relentless Frontier
Below are 12 single-player Steam games similar to Relentless Frontier, 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 Relentless Frontier page.
Ranked picks
- 1
Mekkablood: Quarry Assault
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Indie with Relentless Frontier.
The Year is 2082. You play the role of Bill, a grizzled, and extremely hairy robojockey. It's up to you to take the reigns of Bill's Mekk, with your friend Rusty, to get your revenge against TorxCorp, who's trying to steal your mining claim.
- 2
Selaco
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Indie with Relentless Frontier.
Selaco is a brand new original shooter inspired by classics, featuring thrilling action set pieces, destructibility, smart enemies and a fleshed out story taking place within an immersive game world.
- 3
The Revival
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Indie with Relentless Frontier.
The Revival is a story-based, tactical stealth First-Person Shooter game which is set in the near future. Get ready for covert operations. Play as a well-trained special soldier who fights on his own against his deadly competitors.
- 4
BRINE
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Early Access with Relentless Frontier.
Something smells fishy in Cornwall. A mutated, violent uprising of local seafood has surged from the depths, claiming the coast for themselves. At the centre stands a disgruntled fisherman. Fight through quintessentially Cornish environments in retro FPS flair. Half the res, double the fun!
- 5
Diluvian Ultra
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Indie with Relentless Frontier.
Diluvian Ultra is a single-player, first-person shooter focusing on a retro aesthetic and fast-paced, strategic combat. The game is set in its own expansive fictive universe. Rather than gritty or dark, Diluvian Ultra is colorful and fantastical, like the cover of pulp sci-fi novels of the past.
- 6
Galactic Vault
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Indie with Relentless Frontier.
Build your weapon to its full potential in Galactic Vault, a fast-paced FPS roguelite. Discover endless upgrade combinations, craft diverse builds, and unleash devastating abilities. Get ready to infiltrate high-security vaults and recover lost tech.
- 7
Starship Troopers: Ultimate Bug War!
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Indie with Relentless Frontier.
Lock and load into the Starship Troopers universe and join the Mobile Infantry in the most realistic depiction of war ever made! Experience an original story in this action-packed, first-person retro shooter. Would you like to know more?
- 8
METAL EDEN
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action and Adventure with Relentless Frontier.
An adrenaline-rush sci-fi FPS. A HYPER UNIT ASKA is sent on a suicide mission to rescue citizens' COREs from MOEBIUS, an orbital city turned into a deadly trap. Dive into cybernetic warfare, face the ENGINEERS, and uncover the secrets of METAL EDEN.
- 9
Quake
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action with Relentless Frontier.
Developed by the award-winning id Software, Quake® is the ground-breaking, original dark fantasy first-person shooter that inspires today’s retro-style FPS games. With Quake (Enhanced), experience the authentic, updated, and visually enhanced version of the original.
- 10
Quake II
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action with Relentless Frontier.
You are humanity’s last hope to stop the Strogg, a hostile alien race waging war against Earth. Play this military sci-fi FPS, now upgraded for modern platforms with improved visuals, new campaign content, online multiplayer/co-op, and more.
- 11
HeXen II
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action with Relentless Frontier.
The Four Horsemen of the Apocalypse lurk in the shadows before you. They are Death, Pestilence, Famine, and War. They are the root of all that is evil, but the least of your worries. The last of the three Serpent Riders yet lives.
- 12
DOOM
Single-player alternative to Relentless Frontier — playable solo, no multiplayer required. Shares Action with Relentless Frontier.
Now includes all three premium DLC packs (Unto the Evil, Hell Followed, and Bloodfall), maps, modes, and weapons, as well as all feature updates including Arcade Mode, Photo Mode, and the latest Update 6.66, which brings further multiplayer improvements as well as revamps multiplayer progression.