What the A1Z26 cipher is: every letter is replaced by its position in the alphabet. A becomes 1, B becomes 2, and Z becomes 26. The rule never changes, which makes it the easiest substitution cipher to learn and the one that turns up most often in escape rooms, puzzle hunts, and games.
How a session works:
- Decode rounds show numbers and ask you to type the letter, word, or message.
- Encode rounds show letters and ask you to type the number sequence.
- Hyphens separate letters inside a word. A slash separates words inside a message.
- Easy uses single letters and short words. Medium adds longer words and two-word messages. Hard uses long words and full messages. Mixed rotates through all three.
- Training mode marks each round right away and shows the full conversion. Test mode holds feedback back until the results screen, where a round-by-round review opens automatically.
- The alphabet reference is set to Automatic by default: it appears during Training rounds and disappears in Test mode. You can force it always on or always off in Advanced Settings.
- Spelling counts, but spacing, capitalization, and punctuation do not. Encode answers accept hyphens, spaces, commas, or dots.
- Press Enter to submit, then Enter again to move on. Skipping marks the round wrong.
- If you switch away from the tab during a timed round, the clock pauses until you come back.
Full A1Z26 reference chart:
A 1
B 2
C 3
D 4
E 5
F 6
G 7
H 8
I 9
J 10
K 11
L 12
M 13
N 14
O 15
P 16
Q 17
R 18
S 19
T 20
U 21
V 22
W 23
X 24
Y 25
Z 26
Tips for getting faster:
- Memorize the anchors first: E is 5, J is 10, O is 15, T is 20, Y is 25. Every other letter is one or two steps away.
- Any number of 10 or more starts with 1 or 2, so a trailing 1 or 2 on its own must be A or B.
- In decode rounds, look for common short words: 20-8-5 is THE, 1-14-4 is AND.
- Work in Training mode until your accuracy is steady, then switch to Test mode — the reference chart drops away on its own.