Early Finisher Code Breakers
Quick, no-prep code puzzles in three difficulty levels
- Grades 3–7
- 5–15 minutes
- Mixed
- 9 exercises
- Answer key included
A no-prep mini-pack designed for the students who always finish first. It steps through three difficulty levels — the A1Z26 number code, a Caesar shift-3 cipher, and the Atbash mirror alphabet — so fast finishers get a genuine challenge rather than busywork, and the answer key lets them self-check without waiting for the teacher. Print the student PDF and answer key below, or solve on this page.
Printable PDF — free to download & print
How to use this worksheet
A no-prep mini-pack for students who finish early. Level 1 uses the A1Z26 code (A=1). Level 2 uses a Caesar cipher with a shift of 3. Level 3 uses the Atbash mirror alphabet (A=Z). Each puzzle takes just a few minutes; check your work against the answer key when you are done.
Exercises
- 1. Level 1 — Decode (A=1): 3 1 20
- 2. Level 1 — Decode (A=1): 19 21 14
- 3. Level 1 — Encode (A=1): DOG
- 4. Level 2 — Decrypt (Caesar shift 3): KHOOR
- 5. Level 2 — Encrypt (Caesar shift 3): SUN
- 6. Level 2 — Decrypt (Caesar shift 3): FDW
- 7. Level 3 — Decode (Atbash): GVHG
- 8. Level 3 — Encode (Atbash): CODE
- 9. Level 3 — Decode (Atbash): SVOOL
Full solutions are on the downloadable answer key (PDF).