Single-player games like Calyx
Below are 11 single-player Steam games similar to Calyx, 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 Calyx page.
Ranked picks
- 1
Here Comes The Swarm
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
Here Comes the Swarm is a survival RTS with a pause button! Create your strategy, build, manage, and defend your settlements at your own pace. Take the fight to the hive mind and lead expeditions to deliver a deadly blow and eradicate your foes. Will you reclaim Ulora from the relentless Swarm?
- 2
Giantfall
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Build your medieval kingdom. Raise an army. Defend against towering Giants and monstrous creatures as they lay siege to everything you've built
- 3
Dead Night Highway
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Dead Night Highway is a compact colony simulator where a group of survivors on their journey west sets up camps to replenish resources, but zombie horde only grows larger...
- 4
Space Tales
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
Space Tales is a sci-fi RTS where you build fortified bases, manage resources, and command retro-futuristic armies. Adapt to deadly alien factions, capture giant bosses, and turn them into powerful allies as humanity fights to survive among the stars.
- 5
Littlest Catalyst
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Command a crew of tiny bots, build a modular space base, and repel relentless alien swarms. Build, upgrade, defend, but don't stay too long, the hive is closing in.
- 6
Rebellion Corporation
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
On planets occupied by robots, mine resources and escape while fending off their attacks! The Ark's survival is entirely in your hands. Many elite crews with abilities will assist you in your mission. The various turret modules are always doing their best to defend your base without your attention.
- 7
Negative Energy
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
Negative Energy is a tower defense game with basic RTS mechanics, where your goal is to defend the construction of a Dyson sphere, while fighting against waves of hundreds of enemies ships.
- 8
Kingdoms in Arms
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Kingdoms in Arms is a strategy game where you build and manage your kingdom. Build cities, outposts and military camps to conquer the whole island. Besiege your enemies castles and bring down their walls with your siege engines like catapults and trebuchets. Control your armies in real time.
- 9
SC2VN - The eSports Visual Novel
Single-player alternative to Calyx — playable solo, no multiplayer required.
SC2VN is a visual novel about the South Korean StarCraft 2 scene. You play as Mach, a foreign semi-pro trying to make it in eSports who soon learns that success in StarCraft takes more than in-game strategy.
- 10
Creeper World: Anniversary Edition
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Imagine an enemy that is everywhere and moves like a giant, organic mass across the map. Imagine your base and your people surrounded by a blanket of crushing destruction from all directions. Your only hope, well what hope? Then you take the high ground and pound this enemy into oblivion.
- 11
Age of Empires: Definitive Edition
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Age of Empires, the pivotal real-time strategy game that launched a 20-year legacy returns with modernized gameplay, all-new 4K visuals, 8-person multiplayer battles and a host of other new features. Welcome back to history.