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The purple laser gun should work if you pick it up in any moddable mode. The list that you keep seeing under Extras menu isn't where you pick them to play, it just tells you what you have installed and you can deactivate them there. So the only reason you don't see anything under singleplayer is because you have no Single player maps downloaded.
https://steamhost.cn/steamcommunity_com/workshop/browse?searchtext=&childpublishedfileid=0§ion=items&appid=41010&browsesort=trend&requiredtags%5B%5D=Single+Player&requiredtags%5B%5D=Cooperative&requiredtags%5B%5D=Custom+Campaign Here is all the custom campaigns you may want to play.