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Steam adds "Boomer Shooter" as an official tag
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So arena shooters Ala quake and unreal basically.
That and older titles like doom and quake and Wolfenstein.
And Doom(2016)
Nah because it covers stuff like Duke or Shadow Warrior, which are large sprawling campaigns on, for their time, large open maps.
It’s literally just all FPS games from before like 2003 and those that look like those generations of graphics.