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
15 challenges matching your filters
Clear topic filter- Multiple ChoiceIntermediate
[Linux] inode VFS and disk
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] Hard link VFS and disk
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] Symlink VFS and disk
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] ext4/xfs VFS and disk
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] mount VFS and disk
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] ps Creation and management
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] top/htop Creation and management
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] kill Creation and management
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] nice/renice Creation and management
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] zombie Creation and management
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] SIGTERM (15) Asynchronous notifications
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] SIGKILL (9) Asynchronous notifications
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] SIGHUP (1) Asynchronous notifications
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] SIGINT (2) Asynchronous notifications
qalinuxlinuxqa - Multiple ChoiceIntermediate
[Linux] SIGUSR1/SIGUSR2 Asynchronous notifications
qalinuxlinuxqa
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.