Related Clues:

• Not rocket science, returning post-ready envelope with address unknown
• Susceptible to a piece of cake
• Some are as yachties — tolerant
• Quickly gettable
• Beginners' game mode
• Some are as yobs — simple!
• "Settle down now"
• Is not demanding a piece of cake
• Presenting few difficulties
• Without any challenge
• Choppy sea, ultimately stormy, not difficult
• “Piece of cake!”
• Not even close to difficult
• Level for newbie gamers
• Render motionless — don't panic!