Micro:bit Caesar Cipher Hunt

Current round

Decrypt the ciphertext using a Caesar cipher. Round 1 gives you the key. Rounds 2–10 give you a micro:bit code, so you must find that micro:bit to get the key.

Round: /10 Ciphertext:

Teacher setup notes (click to expand)
  • Put a short printed label on each micro:bit with its Code (e.g. R4K7).
  • When students press the micro:bit’s trigger (A, shake, logo, etc.), it should show its Key.
  • This website randomises which micro:bit code is needed next, reducing bottlenecks.

Caesar cipher hint

Decryption means shifting letters backwards by the key. Example: with key 3, khoor decrypts to hello. Only letters a–z are used here.

You have won