{CodeRoyale}
ArenaReviewWorld rankingBlog
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.

Play in the Arena
Filter by type
All typesMultiple ChoiceCode AnalysisCode
Filter by difficulty
All levelsBeginnerIntermediateHard
Popular topics
qa 2066intermediate 1919beginner 1199hard 732javascript 584python 580go 536analysis 530c 499frontend 447backend 445fullstack 441cybersec 428dsa 423mcq 238code-analysis 188architecture 153cpp 150git 150system-design 150http 116algos 90testing 89sql 85

6 challenges matching your filters

Clear topic filter
  • Code AnalysisHard

    Lock-Free Stack ABA Root Cause

    lock-freeabacas
  • Code AnalysisIntermediate

    MPMC queue index race root cause

    MPMClock-freedata-race
  • Multiple ChoiceHard

    Why compare_exchange_weak is preferred in loops

    atomicscaslock-free
  • Multiple ChoiceHard

    lock-free stack ABA mitigation

    lock-freeABACAS
  • Multiple ChoiceHard

    shared_ptr lock-free progress hazard

    shared_ptrlock-freehazard-pointers
  • Multiple ChoiceHard

    Lock-Free Stack ABA Hazard

    lock-freeabacas

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.

© 2026 Code Royale by dionisio.dev — the battle arena where developers get ranked.

3-minute matches · live ranks · daily challenge · coding challenges

Questions or suggestions? Reach out on x.com/dionisiodev