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
13 challenges matching your filters
Clear topic filter- Code AnalysisBeginner
Trace: String Reverse
dsaanalysisstringsbeginner - Multiple ChoiceHard
KMP Algorithm
dsastringshard - Multiple ChoiceHard
Naive vs KMP Pattern Matching
dsastringshard - Multiple ChoiceHard
Rabin-Karp Algorithm
dsastringshard - Multiple ChoiceBeginner
Strings: Comparison
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Joining Operation
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Definition
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Empty String
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Immutability
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Character Access
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Character Count
dsastringsbeginner - Multiple ChoiceBeginner
Strings: Contiguous Sequence
dsastringsbeginner - Multiple ChoiceBeginner
std::format return type
std::formatC++20strings
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.