Games like Operation Armstrong
Games like Operation Armstrong include Overcooked! 2, Monaco: What's Yours Is Mine, Gang Beasts, The Escapists 2, and Broforce. We matched them by the tags players give Operation Armstrong on Steam (Local Co-Op, Stealth, Indie, Action, and Strategy): closest matches first, and among equally close ones the better-known games.
Overcooked! 2
Shared: Local Co-Op · Co-op · Multiplayer
Monaco: What's Yours Is Mine
Shared: Co-op · Stealth · Local Co-Op
Gang Beasts
Shared: Co-op · Action · Multiplayer
The Escapists 2
Shared: Co-op · Local Co-Op · Strategy
Broforce
Shared: Co-op · Local Co-Op · Action
Keep Talking and Nobody Explodes
Shared: Co-op · Local Co-Op · VR
Ultimate Chicken Horse
Shared: Local Co-Op · Multiplayer · PvP
PAYDAY 2
Shared: Co-op · Action · Stealth
Awesomenauts
Shared: Local Co-Op · Indie · Action
Dota 2
Shared: Strategy · Multiplayer · Action
Brawlhalla
Shared: Multiplayer · Co-op · Local Co-Op
Counter-Strike 2
Shared: Action · Multiplayer · Co-op
Human Fall Flat
Shared: Co-op · Multiplayer · Local Co-Op
It Takes Two
Shared: Co-op · Local Co-Op · Multiplayer
BattleBlock Theater®
Shared: Co-op · Local Co-Op · Multiplayer
Pummel Party
Shared: Multiplayer · Co-op · Local Co-Op
Stick Fight: The Game
Shared: Action · Multiplayer · Local Multiplayer
Bopl Battle
Shared: Local Co-Op · Action · Multiplayer
PUBG: BATTLEGROUNDS
Shared: Multiplayer · Action · PvP
Party Animals
Shared: Co-op · Multiplayer · Action
Phasmophobia
Shared: VR · Co-op · Multiplayer
Unrailed!
Shared: Co-op · Local Co-Op · Multiplayer
Dead by Daylight
Shared: Co-op · Multiplayer · Stealth
PICO PARK
Shared: Co-op · Local Co-Op · Multiplayer