Problems(Questions) in BrainF**k

SORTING and MULTIPLY only allow Brainf**k. CRYPTO3 and SBSTR1 also allow only esoteric languages.

Those are the ones I remember, though there may be others.

If you feel up to the challenge, you might even choose to solve problems not specifically designed for Brainf**k in this wonderful language

TEST has been solved in Brainf**k by several people, and a few more problems are also feasible.

Also, EDIT1 (Intercal is also technically allowed) and LIB (a tutorial problem). Also, I solved NOTPALIN in BF

CTQUINE is a language-related quine/golf problem in which BF does better than you might expect (see the ranks).

extreeemely difficult, but still doable, would be GNY07H in BrainF**k. I began it, but it will take some time until I'll finish it. Basically, most problems wich need more than O(1) space are almost impossible, I think.
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What about Befunge?

go straight to Mitch Schwartz's & then Tjandra's spoj profile page.You would find most of the problems there.