I personally like Doom or any FPS with or without a crosshair (I like the option to turn them off), and for ZDoom, I try to find crosshairs that are appealing and not obstructive. I have experimented with some crosshairs, and I'm guessing other people have their own preferences too. Below is a set of simple from scratch ones or Google image search conversions. I generally dislike the larger/more beefy crosshairs. Which crosshairs do other people like or use often?
I wanted to see how large screen-covering diagonal or horizontal crosshairs feel:
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