Uboat stands out as one of the best military simulators on PC to date. Rather than feature a broad view of the Second World War as in strategy games like Company of Heroes 3, Uboat focuses on Germany's submarine warfare with the same granularity as World of Tanks, War Thunder, or World of Warships. It's also been in Early Access on Steam for a very long time, gathering acclaim while its creators worked toward its final version, and has now, at last, come out in full with an accompanying launch discount.
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Beloved submarine milsim Uboat finally leaving Steam Early Access