Opera Fatal
Windows, Mac OS
Braingame Publishing
Operation
Operation 7
Windows
Francisco Antonio
Operation7
iOS, Windows, Linux
Operation8 Project
Operation Abyss: New Tokyo Legacy
Windows, PlayStation Vita
Operation Air Assault
PlayStation 2
Naps Team
Operation Airsoft Beta
Operation Apocalypse
Apple II
Operation Armstrong
Operation Babel: New Tokyo Legacy
PlayStation Vita, Windows
Operation Bagration
Wargaming.net
Operation Barbarossa – The Struggle for Russia
Operation: Black Mesa
Operation: Blockade
Operation Body Count
Windows, Disk Operating System
Capstone Software
Operation Breakout
Operation C
Game Boy
Konami
Operation Chromite 1950 VR
Operation Cleaner
Operation: Cleanstreets
ZX Spectrum, Commodore 64, Atari ST, and 2 more
Operation Com-Bat
Operation Combat II: By Land, Sea & Air
Operation Covid-19
Operation Creature Feature
PlayStation 3
SIE London Studio
Operation Crusader
Mac OS
Operation Darkness
Xbox 360
Success
Operation Deep Magic: Cryptanalysis
Linux, macOS, Windows
Operation Defensive!
Operation Desert Road
RewindApp
