Potential answers for "Difficult, as a problem"

⭐⭐⭐⭐ TOUGH
⭐⭐⭐ POSER
⭐⭐⭐ NUT
⭐⭐⭐ THORNIEST
⭐⭐⭐ AHARDNUTTOCRACK
⭐⭐⭐ STUMPER
⭐⭐⭐ CONUNDRUM
⭐⭐⭐ TOUGHNUT
⭐⭐ MATH

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