Sunless Sea is described as 'Explore the dark and foreboding waters of Fallen London as captain of a steamship. Sunless Sea is an epic, roguelike game of discovery set in the Victorian Gothic universe of Fallen London and played from a real-time, top-down perspective' and is a Roguelike game in the games category. There are five games similar to Sunless Sea for a variety of platforms, including Windows, Steam, Mac, Xbox and Linux apps. The best Sunless Sea alternative is Subterrain. It's not free, so if you're looking for a free alternative, you could try Fallen London. Other Sunless Sea like games are Frozen State, Darkwood and The Flame in the Flood.
Subterrain is a roguelike, sci-fi survival game set in an underground city on Mars. Craft, research, explore and fight to survive the evolving mutant denizens.
Subterrain is the most popular Windows alternative to Sunless Sea.
Subterrain is the most popular commercial alternative to Sunless Sea.
Frozen State is an open-world survival game with roguelike elements. The game casts players into a man-made ice age where hunger, thirst and sleep present constant threats in an already dismal world.
Frozen State is the most popular Mac & Linux alternative to Sunless Sea.
Fallen London is a deep and compelling, though ever humorous, journey of interactive fiction set in the dark Victorian-Gothic underworld. It's played in classic, choose-your-own-adventure style where your choices determine how the story plays out.
Fallen London is the most popular Web-based, Android, iPhone, iPad & Android Tablet alternative to Sunless Sea.
Fallen London is the most popular free alternative to Sunless Sea.
Travel by foot and by raft down a procedurally-generated river as you scrounge for resources, craft tools, remedy afflictions, evade the vicious wildlife, and most importantly, stay ahead of the coming rains.
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