Single-player games like Mainframe Defenders
Below are 16 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
Star Renegades
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Star Renegades is a dimension spanning rogue-lite strategy RPG. Outsmart uniquely generated adversaries, forge bonds between heroes and end the cycle!
- 2
Into the Breach
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Control powerful mechs from the future to defeat an alien threat. Each attempt to save the world presents a new randomly generated challenge in this turn-based strategy game.
- 3
Mech Armada
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Create and command custom Mechs to outmaneuver The Swarm in this post-apocalyptic tactical turn-based rogue-lite. Leverage the terrain, learn each Mech's unique skills and use strategy and resources to survive an ever-changing series of battles to give humanity hope.
- 4
The Last Spell
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Defend the last bastion of humanity with your squad of heroes! Exterminate fiendish monsters with magic and brute force by night and re-build your battered city defenses by day in this tactical RPG with rogue-lite mechanics.
- 5
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.
- 6
Bionic Dues
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Bionic Dues is a tactical, turn-based roguelite with mech customization. Out-think wide-ranging tactical situations featuring robots with bad GPS, terrible aim, insecurity, a lack of focus, a tendency to backstab, and dozens of other maladies to exploit.
- 7
Desktop Dungeons: Rewind
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Desktop Dungeons: Rewind bestows bites of tactical roguelike action, which will quickly fester into a deep, lingering, and strategic obsession. Bargain with gods, equip your spoon and pick your battles, before retreating into the healing darkness. But beware… there are still many monsters to face!
- 8
StarVaders
Single-player alternative to Mainframe Defenders — playable solo, no multiplayer required. Shares Strategy and Indie with Mainframe Defenders.
Pilot a powerful mech to fight off the alien invasion in this ULTIMATE fusion of deckbuilding and grid-based tactics. Discover game-breaking combos, rewind time to alter your fate, and protect the future of humanity in this endlessly replayable roguelike.
- 9
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.
- 10
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.
- 11
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.
- 12
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.
- 13
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.
- 14
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.
- 15
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.
- 16
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.