Related Clues:

• Child's play
• See 16-Down
• 'Easy!'
• 'Piece of cake!'
• Easy as pie
• See 33-Down
• 'Duck soup!'
• See 25-Down
• 'No prob'
• Something easy
• Like child's play
• 'It's ___!' ('Simple!')
• "Piece of cake!"
• "No sweat!"
• No challenge