Potential answers for "They're tough to crack"

⭐⭐⭐⭐ CODES
⭐⭐⭐ ENIGMA
⭐⭐⭐ NUT
⭐⭐⭐ GNARLYPROBLEM
⭐⭐⭐ ACORN
⭐⭐⭐ SAFES
⭐⭐⭐ ENIGMATIC
⭐⭐⭐ HARD

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