Possible Clues:

• Involved in games and puzzles
• Recalled trap set in identical puzzles
• Twin full of spirit rejected such mysteries
• Puzzles — riddles
• Setter's upset over good answers to puzzles
• Game in wild saved primarily by those posing the difficult questions
• Puzzles and games in redevelopment
• Gas in me exploded, producing problems
• Puzzles formulated in games
• Tough nuts to crack