Wii Sports Resort: "One Hit Wonder" Stamp Does Not Exist

There is no "One Hit Wonder" stamp in Wii Sports Resort.

Stamps are earned by:

• Winning tournaments (Swordplay, Table Tennis, Golf, etc.)
• Completing sport-specific challenges (e.g., "Hit 10 home runs," "Perfect 300 in Bowling")
• Reaching proficiency milestones (★1–★5) in each sport

Check the Stamp List in the game's menu for exact requirements per sport. Focus on mastering each activity's mechanics to unlock them all.