1: "In a crowd, can you spot the apple that's missing a bite in just 21 seconds? Only one in 20 can."

2: "Prove your skills with this quick challenge. Test your eyes and find the eaten apple before time's up."

3: "Can you beat the odds and discover the missing apple in less than half a minute? Share your results!"

4: "21 seconds, one apple, and a missing bite. Are you part of the elite few who can solve this visual puzzle?"

5: "Spot the eaten apple fast to show off your eagle eye. Only 5% of people can accomplish this task."

6: "Are you the chosen one who can find the eaten apple in just one go? Challenge your friends and see who's quickest!"

7: "Join the exclusive club of individuals who can locate the missing apple in the blink of an eye. Are you up for the challenge?"

8: "Test your attention to detail with this speedy apple search. Can you identify the bitten fruit in record time?"

9: "Only the sharpest observers can spot the difference in 21 seconds. Can you find the eaten apple among the rest?"