| 100% | ATOMIC | 6 | The first letter in 84-Across |
| 70% | ESS | 3 | The first letter in "Stop," phonetically |
| 68% | DISC | 4 | Expand the first letter in "DJ" |
| 68% | DISUNION | 8 | State of division, and what the first letters of the states divided across black squares in this puzzle spell out |
| 68% | SOFTG | 5 | The first letter in "gigantic," but not the third |
| 67% | BETH | 4 | First letter in the Torah |
| 66% | ALEPH | 5 | First letter in the Hebrew alphabet |
| 66% | ALPHA | 5 | First letter in the Greek alphabet |
| 66% | ALFA | 4 | First letter in the NATO alphabet |
| 66% | BLUE | 4 | Color of the first letter in the Google logo |
| 66% | TSE | 3 | The first letter of "tsar," in Cyrillic |
| 66% | ALFA | 4 | First letter in the NATO phonetic alphabet |
| 65% | PSI | 3 | First letter in the Greek spelling of "Psyche" |
| 64% | BANG | 4 | Sound suggested by the first letters of the words in 17-, 26-, 44- and 58-Across |
| 63% | TAU | 3 | First letter in the fourth quarter of the Greek alphabet |
| 62% | FRUIT | 5 | What you get if you change the first letter in "demon," "dime" or "drape"? |
| 62% | ETA | 3 | First letter in the Greek alphabet whose name is three letters long |
| 61% | BLACK | 5 | The circled letters in the first shaded area |
| 61% | THEOTHERAMERICA | 15 | Read the first letter in each clue to get a quote from this '67 speech |
| 60% | ABCDF | 5 | Tripled letters in the longest Across answers |
| 59% | NEWS | 4 | First letters of the words hidden in the four longest answers |
| 58% | PHONETIC | 8 | Apt word spelled out by the first letters of eight answers in this puzzle |
| 58% | INFO | 4 | What the final letter in 1 Across stands for, casually |
| 57% | ABCD | 4 | First four letters in the alphabet |
| 57% | XXXXX | 5 | Shape of the first and last letters in the Subway logo |
| 57% | FUN | 3 | First Across word in the world's first crossword |
| 56% | FUN | 3 | First word across in the world's first crossword (1913) |
| 55% | YEAR | 4 | Span represented by the first three letters of 12 answers in this puzzle |
| 54% | AMBULANCE | 9 | Vehicle whose sound is imitated by the first three Across entries in this puzzle |
| 54% | OREO | 4 | Cookie in the shape of its first and last letters |