The School Code Breaking Site
Code Breaking Puzzles to Solve for KS3 and GCSE Students
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2026 Competition
2026 competition registration
Level 1A Intro 2026
Level 1A Introduction 2026
Level 1B Intro 2026
Level 1B Introduction 2026
Level 2A Intro 2026
Level 2A Introduction 2026
Level 2B Intro 2026
Level 2B Introduction 2026
Level 3 Intro 2026
Level 3 Introduction 2026
Level 4 Intro 2026
Level 4 Introduction 2026
2025 competition
Level 1A Intro 2025
Level 1A Introduction
Level 1A Code 1 2025
Level 1B Intro 2025
Level 1B Introduction
Level 1B Code 1 2025
Level 2A Intro 2025
Level 2A Introduction
Level 2A Murder Mystery Introduction
Level 2B Intro 2025
Level 2B Introduction
Level 2B Treasure Hunt Code 1 2025
Level 3 Intro 2025
Level 3 Introduction
Level 3: Spy Thriller Code 1 2025
Level 4 Intro 2025
Level 4 Introduction
Level 4 Test of Genius 1
Bonus Level 2025
Bonus Level: Computer Coding Intro
Bonus Level 1 Reversing Text 2025
2024 competition
Level 1A 2024: Code 1
Level 1B 2024: Code 1
Level 2A 2024: Code 1
Level 2B 2024: Code 1
Level 3 2024: Code 1
Level 4 2024: Test of Genius
2024 FAQ
Other Challenges
2023 competition
FOBISIA 2023 LEVEL 1A: CODE 1
FOBISIA 2023 LEVEL 1B: Murder Mystery CODE 1
FOBISIA 2023: LEVEL 2 CODE 1
FOBISIA 2023 LEVEL 3 CODE 1
FOBISIA 2023 LEVEL 4: Test of Genius
2022 Competiton
FOBISIA 2022 LEVEL 1: Code 1
FOBISIA 2022 LEVEL 2: Code 1
FOBISIA 2022 LEVEL 3: Code 1
FOBISIA 2022 LEVEL 4: Code 1
Code Challenge Level 1
Code Challenge Level 4
Code Challenge Level 5
Code Challenge 5Extra
Code Challenge Level 6
Code Challenge Level 7
Resources
Code Breaking Resources
About Jane Street
About BISP
Level 1B Introduction 2026
This competition will be live from 21st September.
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