challenges

Classic FizzBuzz — tests basic correctness and code style

Binary search implementation with full docs

Write a small HTTP API client class with error handling and docs

Write a README for a CLI tool — tests documentation ability directly

Refactor messy code and explain each change

Write pytest tests for a provided function — tests edge-case thinking and assertion quality

Find and fix 3 bugs in broken Python code — tests careful reading and correctness reasoning

Write async Python for concurrent HTTP fetching with timeout and retry

Write a complex SQL query with CTEs, window functions, and aggregations

Write idiomatic Go table-driven tests — tests knowledge of Go testing conventions

Write idiomatic Elixir ExUnit tests — tests knowledge of Elixir testing conventions

Build a Doom-style raycasting FPS engine in a single HTML file — the mager-bench signature challenge

Build a Vegas-style slot machine in a single HTML file — reels, pay table, betting, wins