Challenge Library
Coding Challenges
5,893 curated questions across every arena — browse by topic, then jump into a live 3-minute battle to put them to the test.
Filter by type
Filter by difficulty
Popular topics
6 challenges matching your filters
Clear topic filter- Multiple ChoiceBeginner
Strangler Fig core idea
architecturemigrationstrangler-fig - Multiple ChoiceIntermediate
Branch by abstraction vs feature branch
branch-by-abstractionstrangler-fig - Multiple ChoiceIntermediate
Strangler Fig Approach
strangler-figmigrationincremental - Multiple ChoiceHard
Strangler routing: shadow traffic
architecturemigrationstrangler-fig - Code AnalysisIntermediate
Strangler with broken routing
architecturemigrationstrangler-fig - Code AnalysisBeginner
Strangler deletion debt
architecturemigrationstrangler-fig
Practice now, dominate the arena
Every challenge here is drawn from the live Code Royale pool. Review a question, then head to the arena to answer under pressure against a real opponent — 3-minute matches, Elo ranking, and badge tiers on the line.