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Secret Code Word Search

A word search whose word list is written in code. The decoder sits beside the list, so you crack each word, or just a letter or two of it, and then find it in the grid, where it is spelled plain.

Theme: Space Play only this theme →

J
W
J
K
I
F
L
L
M
Y
I
N
J
Q
T
Y
G
D
E
C
O
L
C
T
E
O
M
G
T
C
H
I
I
J
L
F
S
A
E
O
O
Z
E
H
E
S
Z
L
O
M
R
L
Z
Z
S
A
Z
A
R
E
B
H
M
P
C
T
F
X
H
T
I
Z
O
N
O
U
S
Y
Z
P
T
A
O
I
P
R
P
S
T
K
Q
L
N
X
E
N
W
Q
Z
O

Theme: Space

0/7

Decoder A-003 Shift each coded letter forward by 3 (A→B is +1).

A → D B → E C → F D → G E → H F → I G → J H → K I → L J → M K → N L → O M → P N → Q O → R P → S Q → T R → U S → V T → W U → X V → Y W → Z X → A Y → B Z → C
  • DXIXUV
  • JBQBLO
  • JLLK
  • LOYFQ
  • PXQROK
  • QBIBPZLMB
  • ZLJBQ
Solved! 🎉

Every new puzzle here takes one of the site's 476 topics at random. To stay on one topic, open its page and set Mode to Secret Code. View all topics

The list is in code, and the key is right there

A secret code word search gives you the word list in cipher. URFNHW is on the list; ROCKET is in the grid. The decoder sits above the list and every word uses the same one, so once you have read it you can turn any coded letter back. The puzzle is in the reading: a shift of three on Easy, a mirrored alphabet or a bigger shift on Medium, and on Hard an alphabet scrambled by a keyword, where the table is the only way.

You don't have to decode a whole word to find it. Two or three decoded letters are usually enough to go hunting for in the grid, which spells every word plain, and the rest of the word is sitting there when you arrive. When a row has been found, or when you press Decode, it shows the word in plain letters.

Three ciphers, two thousand years old

The Easy cipher is the oldest trick in the book. The Roman writer Suetonius says Julius Caesar wrote private letters by moving every letter three places along the alphabet, so that A became D, and the shift cipher has carried his name ever since. The mirror cipher on Medium is older still: Atbash swaps the first letter of the alphabet for the last, the second for the second-last, and so on, and it turns up in the Hebrew Bible. The keyword cipher on Hard writes the keyword at the front of the alphabet, drops the repeats, and follows it with whatever letters are left, so the table looks random and only the keyword explains it.

Those accidents are why a coded word can look like a real one. They are rare enough that the list never trips over them, but they are the reason codebreakers never trust a single word: a cipher is cracked when the whole message makes sense, not one piece of it.

Cracking a row

As dealt (shift of 3)
  • OLZHBQ
After a press of Decode
  • Rocket
Once you have found it
  • Rocket
One entry from the Space theme, at three moments. The list shows the code until the word is found in the grid, or until Decode reads it for you.

Read the decoder first, before any word. On a shift, count how far: if A has become D, every letter has moved three, and you can decode in your head by stepping back three places. On a mirror, remember that A and Z swap, so a coded Z is A and a coded Y is B, and the middle of the alphabet, M and N, swap with each other. On a keyword table there is no shortcut, so decode the shortest word on the list first: three letters looked up is quicker than nine, and the first word you crack usually tells you the theme's vocabulary too.

A first lesson in cryptography

Substitution ciphers are where every book on codes begins, because the idea fits in one sentence and breaking one is a real skill. A class can go a long way with this page: Easy is a shift to count, Medium introduces a mirror, and Hard is a table you have to use letter by letter, which is how a real decoder works. For a topic to match, try Ancient Rome for Caesar's own era, or cybersecurity for where ciphers ended up. Every topic page has the mode in its Mode picker, and Play only this theme above the grid takes you to the page of whichever theme is on the board. For the other kinds of word search here, see types of word search.