| 100% | DECODE | 6 | Decipher a secret message |
| 72% | CODED | 5 | Like a secret message |
| 72% | DECODE | 6 | Unscramble a secret message |
| 69% | ENCODE | 6 | Make difficult to decipher, as a secret message |
| 66% | ENCODE | 6 | Scramble, as a secret message |
| 66% | ENCODE | 6 | Cipher, as a secret message |
| 66% | DECODE | 6 | Crack, as a secret message |
| 66% | DECODED | 7 | Cracked, as a secret message |
| 66% | ENCODE | 6 | Convert into a secret message |
| 66% | ENCODED | 7 | Converted into a secret message |
| 66% | DECODES | 7 | Solves, as a secret message |
| 66% | ENCODE | 6 | Write, as a secret message |
| 66% | ENCODES | 7 | Converts into a secret message |
| 65% | INK | 3 | Disappearing liquid for a secret message |
| 65% | INK | 3 | Invisible ___ (medium for a secret message) |
| 63% | MORSE | 5 | Code used to convey a secret message, typically |
| 59% | CODE | 4 | Secret message that can be cracked with a key |
| 59% | BCCED | 5 | Sent secret messages to, in a way |
| 58% | INVISIBLEINK | 12 | Secret message technique ... and a hint to four puzzle clues |
| 56% | CIPHER | 6 | Put a message into secret code |
| 52% | DISAPPEARINGINK | 15 | Medium for secret messages, and a hint to making sense of 12 Down answers |
| 51% | GULLIBLE | 8 | How you might feel after reading the third letter of every clue in this puzzle for a secret message |
| 48% | LFIXLEVIRHYOLDM | 15 | Secret message |
| 48% | CODE | 4 | Secret message |
| 48% | CODES | 5 | Secret messages |
| 47% | BCCS | 4 | Secret message inclusions |
| 47% | BCC | 3 | Secret message letters |
| 47% | PEEP | 4 | A secret look |
| 47% | INON | 4 | ___ a secret |
| 46% | TRYST | 5 | A secret romantic meeting |