If you liked this
Games like Defcon 5
If you finished Defcon 5, the closest matches are Star Citizen, No Man's Sky, Abiotic Factor, System Shock and Retrospace. All 36 share its adventure genre and are ranked by how closely their themes and modes overlap.
Star Citizen
74
No Man's Sky
92
Abiotic Factor
80
System Shock
80
Retrospace
80
Sniper Elite: Resistance
95
Grand Theft Auto III
87
Everspace 2
36
7 Days to Die
80
Black Skylands
59
Squirrel with a Gun
81
Sniper Elite 5
90
Thief II: The Metal Age
83
Atari 50: The Anniversary Celebration
Slime Rancher 2
Gray Zone Warfare
81
Bonelab
82
Elite: Dangerous
Tower Unite
82
The Long Dark
83
Thief: Deadly Shadows
69
Mount & Blade: Warband
StarRupture
78
Slime Rancher
81
Noita
Misery
90
No Man's Sky: Nintendo Switch Edition
76
Chernobylite
69
DayZ
83
The Riftbreaker
83
Lovers in a Dangerous Spacetime
75
State of Decay
69
Tomb Raider: Anniversary
69
Ark: Survival Evolved
70
Hell is Others
60