| 100% | AEIOU | 5 | Letters that appear once each in a supervocalic word |
| 51% | CENT | 4 | Word that appears in capital letters on the back of a penny |
| 47% | HAPAX | 5 | ___ legomenon (word that appears only once in a manuscript) |
| 45% | MAD | 3 | Word that appears four times in a 1963 film title |
| 45% | JUMP | 4 | Word that can precede each set of circled letters, forming a literal hint for entering certain answers in this puzzle |
| 45% | MAD | 3 | Word that appears four times in a 1963 comedy film title |
| 43% | RUS | 3 | Letters that once followed a lots of Toys before Chapter 11 bankruptcy in 2017 |
| 43% | EYE | 3 | Watcher ... and homophone of a letter that appears exactly once in every clue and all but two answers |
| 42% | ONE | 3 | Word that appears on a dime in both English and Latin |
| 41% | AYE | 3 | Word that sounds like a letter of the alphabet that's not in it |
| 41% | FEEDBACK | 8 | English word that contains each of the letters ABCDEF at least once |
| 40% | DEAL | 4 | Word that appears twice in the name of a game show hosted by Howie Mandel |
| 40% | AEIOU | 5 | Letters in a so-called "supervocalic" word |
| 40% | ADO | 3 | Word meaning "commotion" that appears in a Shakespeare play's title |
| 39% | PSI | 3 | Letter that appears twice in the Schrödinger equation |
| 39% | PSI | 3 | Letter that appears twice in the Schrodinger equation |
| 38% | AEIOU | 5 | Letters found in a so-called "supervocalic" word |
| 38% | XXXXX | 5 | Largish combo (and a hint to the number of letters in each country that you'll need) |
| 38% | IES | 3 | Letters that replace Y in a plural |
| 37% | KUE | 3 | Letter that doesn't appear in this puzzle |
| 37% | EL | 2 | Letter that starts each clue in this puzzle |
| 37% | XES | 3 | Letters that symbolize kisses in a love note |
| 37% | ASA | 3 | Words that connect each pair of four-letter words intersecting at a circle |
| 37% | COMMA | 5 | Punctuation mark that might appear many times in a long list of words |
| 36% | JUMPAROUND | 10 | House of Pain hit that begins "Pack it up, pack it in," and a description of each set of circled letters |
| 36% | TEE | 3 | End of each word in 17-, 27-, 43- and 54-Across - as well as every clue (and that's a fact!) |
| 36% | DEAR | 4 | Word that often starts a letter |
| 36% | ARE | 3 | Word that sounds like a letter |
| 36% | SINCERELY | 9 | Word that might end a letter |
| 36% | ACROSTIC | 8 | The first letter of each line spells a word |