Single-player games like Mainframe Defenders
Below are 19 single-player Steam games similar to Mainframe Defenders, 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 Mainframe Defenders page.
Ranked picks
- 1
Tyrant Tactics: Birth of Revolution
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
2088AD: The corrupt United Nations of Earth has succeeded in gaining control over the entire earth sphere. Unless you and your comrades can stop them using your secret weapon: the Tyrant combat mech. Build armies, assign commanders, and lead them in battle to liberate Earth and the Lunar Colonies!
- 2
GearHead Caramel
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
A turn based tactics style Roguelike mecha RPG set in a world recovering from the apocalypse. Take control of an 18m, 50 ton death machine and build a team of unique lancemates. Features include a detailed mecha design system, procedural narrative, and both mecha + personal scale combat.
- 3
Celestial Fragments
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy with Mainframe Defenders.
Command your robot army in this turn-based tactics game as you battle across the solar system. Conquer asteroids, construct bases, and upgrade your forces as you become a critical element of an interplanetary power struggle.
- 4
Forsworn
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Stack game-breaking synergies until your party can slay gods. Command a party of heroes, forge powerful synergies, and level them up across runs in this turn-based tactics roguelite. Battle the gods solo or in co-op, where defeat is just another beginning.
- 5
HexCrawler
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Lead a party of three heroes through brutal turn-based tactical battles on a hexagonal grid. Build powerful synergies, adapt to unpredictable encounters, and survive deadly procedurally generated dungeons where every decision matters.
- 6
Rogue Waters
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and RPG with Mainframe Defenders.
Rogue Waters is a Pirate Tactical Turn-Based Rogue-lite. Play as Captain Cutter, commanding your ship and crew through procedurally generated encounters to seek revenge. Recruit, train, and upgrade crew, use powerful sea creatures, and engage in dynamic naval and melee combat to gain the upper hand.
- 7
Aditore
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and RPG with Mainframe Defenders.
Command arcane alloy golems in a tactical mining roguelike. Deploy squads into corrupted zones, extract ores under quota pressure, and survive 3-day expeditions. Every deployment consumes a day. Meet the quota — or be terminated.
- 8
Tyrant's Blessing
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Tyberia has been turned into a paradise by the Tyrant, free from war, suffering, and death - because nearly everyone has been turned into the undead. Take charge of the last living warriors in tactical, turn-based battles and drive the Dead Army into the sea!
- 9
STAR WARS™: Rebel Assault I + II
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required.
ake your T16 through Beggar's Canyon...Then dodge asteroids and blast TIE fighters in a deep space rumble... tackle a fleet of menacing AT-ATs on the icy tundra of Hoth...and ultimately annihilate Vader and the evil Empire with a kamikaze trench run on the infamous Death Star.
- 10
XCOM® 2
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy with Mainframe Defenders.
XCOM 2 is the sequel to XCOM: Enemy Unknown, the 2012 award-winning strategy game of the year. Earth has changed and is now under alien rule. Facing impossible odds you must rebuild XCOM, and ignite a global resistance to reclaim our world and save humanity.
- 11
The Bureau: XCOM Declassified
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required.
The year is 1962 and the Cold War has the nation gripped by fear. A top-secret government unit called The Bureau begins investigating a series of mysterious attacks by an enemy more powerful than communism.
- 12
Cogmind
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Cogmind is a sci-fi roguelike epic in which you play a robot building yourself from components found or salvaged from other robots. Explore a living, breathing world through turn-based tactical combat, or sneak, hack, and fly your way to victory.
- 13
NetHack: Legacy
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Indie and RPG with Mainframe Defenders.
NETHACK: LEGACY is a remastered version of the original NetHack, the deeply rich and complex fantasy D&D roguelike. Hack and slash your way through orcs, dragons, and cockatrices as you explore the perilous procedurally-generated dungeons seeking the Amulet of Yendor.
- 14
UFO ENEMY KNOWN
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Indie with Mainframe Defenders.
Help aliens invade Earth in this procedurally-generated, infinite, 3D shooter game. Fully destructible cityscapes and a wide variety of destruction-wreaking weapons. Visit (rampage and destroy) cities of future Earth and Mars block by block. Chaotic battle scenes as rubble and vehicles pile up.
- 15
Slice&Dice
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Indie with Mainframe Defenders.
Slice & Dice is a puzzle game where the objective is to place the die in the goal frame. Using realistic physics, the player can move the die by affecting the cubes within the environment through a variety of actions like slicing and destroying them. It’s a party game that players and viewers alike can enjoy!
- 16
Lords of Ravage
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Become the Final Boss! Play any way you want, combine followers from different factions, and win spectacular turn-based battles. Expand your Empire of Darkness and seek a powerful artifact that can change the fate of the world.
- 17
Mainframe Defenders: Meltdown - Prologue
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Mainframe Defenders: Meltdown - Prologue is a free version of the turn-based tactical game Mainframe Defenders with a focus on interesting items and customization. Combine upgrades and collected loot to protect the Stargazer complex.
- 18
The Bunker Notes - Horror/Drama Visual Novel
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Indie with Mainframe Defenders.
"The Bunker Notes" is a visual novel about a concrete trap where the past whispers through the cracks of rusted doors. In this world, survival is everything; meeting another person might be your last mistake.
- 19
Lords of Ravage: Dread Knights
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and RPG with Mainframe Defenders.
Free version of a tactical RPG with roguelike elements. Become one of the Lords of Ravage and choose a playstyle that fits you. Combine followers from different factions and raze kingdoms in search of an artifact that can shape the world.