| 100% | OPERA | 5 | "Fidelio" is Beethoven's only one |
| 66% | MINORKEY | 8 | Beethoven's Ninth is in one |
| 65% | SONATA | 6 | Beethoven's "Pathetique" is one |
| 63% | SONATA | 6 | Beethoven's "Pathétique" is one |
| 61% | MINORKEY | 8 | Beethoven's Ninth is written in one |
| 57% | BEETHOVEN | 9 | Fidelio was his only opera |
| 56% | ELISE | 5 | One of Beethoven's bagatelles is dedicated to her |
| 55% | OPERA | 5 | Beethoven's "Fidelio," for one |
| 54% | COMPOSER | 8 | Beethoven was one |
| 54% | PATENT | 6 | Lincoln is the only U.S. president to have one |
| 54% | PRIVATETWEET | 12 | Post that can be accessed only by one's followers |
| 53% | PHD | 3 | Woodrow Wilson is the only U.S. president to have one |
| 53% | MOTTO | 5 | Montana is the only U.S. state with one in Spanish |
| 53% | MBA | 3 | Bush Jr. is the only U.S. president to hold one |
| 53% | PHD | 3 | Woodrow Wilson was the only U.S. prez to have one |
| 53% | PHD | 3 | Woodrow Wilson was the only U.S. president to have one |
| 52% | MBA | 3 | CFO's degree, maybe (Bush is the only president to have one) |
| 51% | ALASKA | 6 | Only U.S. state whose name can be typed on one row of a keyboard |
| 51% | ITHE | 4 | Am ___ only one? |
| 50% | ITHE | 4 | Dierks Bentley's "Am ___ Only One" |
| 50% | MORAL | 5 | Message from one of Aesop's fables, such as "Beauty is only skin-deep" |
| 50% | PARROT | 6 | The kea is the world's only mountain-dwelling one |
| 50% | AMI | 3 | "___ the only one who thinks this is a bad idea?" |
| 50% | AMI | 3 | "___ the only one who thinks this is funny?" (2 wds.) |
| 50% | FAN | 3 | Only the biggest one is at every show |
| 50% | BEETHOVEN | 9 | Composer whose only opera was Fidelio |
| 49% | FIDELIO | 7 | Beethoven's only opera |
| 49% | OPERA | 5 | ''Fidelio'' is one |
| 49% | TWEET | 5 | One of the approx. 3.2 million statements that starts with "If only Bradley's arm was longer" |
| 48% | PHD | 3 | Wilson was the only president with one |