Answer: Secret Code #247

The secret message says:

YOGURT

The secret note decoded: YOGURT
The note, decoded.

Letter by letter

Secret letterBFGILT
Real letterYUTROG

Decode it with Python

This program does the decoding for you. Change the secret and the code to crack other messages!

secret = "BLTFIG"
message = ""

for letter in secret:
    if letter.isalpha():
        position = ord(letter) - ord("A")
        message = message + chr(ord("Z") - position)
    else:
        message = message + letter

print(message)

When you run it, it prints:

YOGURT

Did you know? The mirror code is thousands of years old. It was first used with the Hebrew alphabet, where the first letter swaps with the last, the second with the second-to-last, and so on.