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- Solid, unlike a piece of cake
- Like a tough nut to crack
- Tough to learn
- Player's challenge? I sympathise
- Tiring party, breaking rocks perhaps
- Far from easy
- Difficult; severe
- Like verified facts
- Dickens' times were this tough!
- Word with cash or candy
- Were Dickens' times this tough?
- Harder than it looks
- Causing head-scratching
- Difficult; rigid
- Difficult for daughters to get rid of guest