Related Clues:

• Punch holes in a problem
• Eliminate clods with intellectual challenge
• Crossword clue with holes in it?
• Spread throughout puzzle
• Religious leader died, resurrected around the end of April; it's an enigma
• It may be used to sort out a difficult problem
• Pervade conundrum
• Its entertainment value is questionable
• Puzzling question - sieve
• Ingenious puzzle - sieve
• Brainteaser - sieve
• Sphinx's conundrum?
• Coarse sieve
• It's a problem to purge Germany and the French
• Right to be workshy over head of department with enigma