There are four different things shown below
One Vertical
One Horizontal
Two diagonal
All have one common thing (the ? box) which ties them together
What is it?
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$\begingroup$ Are the light grey lines a part of the puzzle, or is it just how you crafted the puzzle in Excel? $\endgroup$ – John Dvorak Aug 13 '19 at 14:27
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$\begingroup$ No they are not. I drafted on an EXCEL sheet. Thanks $\endgroup$ – DEEM Aug 13 '19 at 14:43
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All are
Jumbled forms of famous internet domains (such .Com, ,edu, .Org, .mil) - which are tied up through WEB - thanks to Omega Krypton
Hence the thing in the box should be
.(a DOT)
answered Aug 14 '19 at 2:57
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The ? box is
the letter K
because
each of the lines of letters anagrams to a word if K is added: DUKE, MILK, MOCK, and GROK.
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$\begingroup$ +1 for the anagram approach. But a simpler solution is hiding there with same approach! $\endgroup$ – DEEM Aug 13 '19 at 18:47
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1$\begingroup$ @DEEM ... but this solution isn't ruled out by the question. If there is some reason (beyond "that wasn't what I was thinking of") why this doesn't solve the puzzle, it's not apparent at all what part of the puzzle actually invalidates this response. Because it seems this should be at least as valid as any other answer you might have in mind, this may be "too broad"—you may need to update the puzzle to make sure invalid responses are demonstrably invalid. $\endgroup$ – Rubio♦ Aug 15 '19 at 3:45
