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I heard of a Sefer or page that someone published of a bunch of unanswered questions (either just on Gemara or in general).
I don't remember the amount of questions but it's between 50-100 I believe.
Does anyone know the name of this Sefer / page
R. David Cohen (of Cong. Gvul Yaavetz in Brooklyn) has a series of seforim consisting of unanswered questions titled ואם תאמר (I-IV, V, VI).
The author of the Chelkas Yoav has a book of (103) unanswered questions called קבא דקשייתא.