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Brain Puzzles · Codes
Secret Ciphers
Crack number codes, shift ciphers and substitution ciphers. Print a fresh sheet with its answer key, or try one on screen.
How to play
- Number code: A = 1, B = 2 and so on, unless the puzzle says it starts somewhere else.
- Shift cipher: every letter slid the same number of places along the alphabet. The alphabet strip helps you count.
- Substitution cipher: each letter swapped for another. Use the hints, then look for short words like A, THE and IS.
What it exercises
Letter patterns and careful counting. Ciphers are a gentle way into how codes work and why some are easier to crack than others.
Levels
- Easy Number codes and small shifts, with the shift given.
- Medium Bigger shifts and number codes with a twist.
- Hard Substitution ciphers with a few hints, and shifts you have to find.