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-3
Yes
You can add 2048 tag.
10
Make 2048 an explicit synonym of sliding-puzzle, retag challenges that need sliding-puzzle
I think it's clear that sliding-puzzle fully covers 2048, as all challenges about 2048 are applicable to sliding-puzzle, but there may be challenges about tile games that aren't specifically about 2048.
However, you raise an excellent point about not enough questions ...
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