Single-player games like M.A.S.S. Builder
Below are 10 single-player Steam games similar to M.A.S.S. Builder, 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 M.A.S.S. Builder page.
Ranked picks
- 1
GUNDAM BREAKER 4
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and RPG with M.A.S.S. Builder.
Create your own ultimate Gundam in the newest Gundam Breaker! With more customizable parts than ever before, you finally have the freedom to build your perfect Gunpla. Test it in battle using the brand new dual-weapon system and break parts off of your enemies and add them to your collection.
- 2
SD GUNDAM BATTLE ALLIANCE
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and RPG with M.A.S.S. Builder.
SD Gundam Battle Alliance is a multiplayer Gundam action RPG where you can smash foes solo or with friends in thrilling mechanized combat. Acquire new mobile suits, power them up, and take them into battle in various missions!
- 3
DAEMON X MACHINA
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action with M.A.S.S. Builder.
Pilot your fully customizable Arsenal mech and join your fellow mercenaries in defending humanity from the corrupted machines and gigantic robots in this post-apocalyptic action game!
- 4
ARMORED CORE™ VI FIRES OF RUBICON™
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action with M.A.S.S. Builder.
A new action game based on the concept of the ARMORED CORE series that uses the knowledge gained from FromSoftware's recent action game development.
- 5
Metal Bringer
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and Indie with M.A.S.S. Builder.
In this roguelike action-adventure, control humanoid "Labor" and giant "Arms" to uncover the mysteries of the world. Create fully-customizable robots, strengthen them, and take down hordes of enemies!
- 6
BREAK ARTS II
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and Indie with M.A.S.S. Builder.
Faster than anyone. Stronger than anyone. And more stunning. Customize your robot for “cyber battle racing” in a game that offers all the thrills of racing, battle, and customization. Online, Offline, Time-Attack... which mode will you dominate?!
- 7
BATTLETECH
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and Strategy with M.A.S.S. Builder.
Take command of your own mercenary outfit of 'Mechs and the MechWarriors that pilot them, struggling to stay afloat as you find yourself drawn into a brutal interstellar civil war.
- 8
The Surge
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and RPG with M.A.S.S. Builder.
Welcome to CREO, the megacorporation saving the world! A catastrophic event has knocked you out during the first day on the job… you wake up equipped with a heavy-grade exoskeleton, in a destroyed section of the complex.
- 9
MechWarrior 5: Mercenaries
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action with M.A.S.S. Builder.
The year is 3015. The battlefields are dominated by war machines known as BattleMechs. Level entire cities and decimate the enemy in your BattleMech. Follow a quest for glory and revenge. Manage an expanding mercenary company. Fight alongside your friends with a four-player PvE co-op.
- 10
Seed of Heroes
Single-player alternative to M.A.S.S. Builder — playable solo, no multiplayer required. Shares Action and Indie with M.A.S.S. Builder.
Journey through the realms with your heroes party. Defeat hordes of enemies in a bullet heaven and reach Valhalla where you belong.