If you liked this
Games like UBoat: The Silent Wolf
If you finished UBoat: The Silent Wolf, 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
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Grand Theft Auto III
87
Everspace 2
80
Black Skylands
36
7 Days to Die
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
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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
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Ark: Survival Evolved
70
Hell is Others
60