Challenge Library
Coding Challenges
5,893 curated questions across every arena — browse by topic, then jump into a live 2-minute battle to put them to the test.
Filter by type
Filter by difficulty
Popular topics
4,318 challenges matching your filters
- Multiple ChoiceIntermediate
[Kubernetes] Replicas Declarative pod management
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Rolling update Declarative pod management
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Rollback Declarative pod management
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Strategy Declarative pod management
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Paused Declarative pod management
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Metrics Horizontal Pod Autoscaler
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Custom metrics Horizontal Pod Autoscaler
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Min/max replicas Horizontal Pod Autoscaler
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Stabilization window Horizontal Pod Autoscaler
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] VPA Horizontal Pod Autoscaler
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Host rules HTTP routing to services
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Path rules HTTP routing to services
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] TLS termination HTTP routing to services
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Annotations HTTP routing to services
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Gateway API HTTP routing to services
qak8sk8sqa - Multiple ChoiceBeginner
[Kubernetes] Shared resources Smallest deployable unit
qak8sk8sqa - Multiple ChoiceBeginner
[Kubernetes] IP address Smallest deployable unit
qak8sk8sqa - Multiple ChoiceBeginner
[Kubernetes] Restart policy Smallest deployable unit
qak8sk8sqa - Multiple ChoiceBeginner
[Kubernetes] Sidecar pattern Smallest deployable unit
qak8sk8sqa - Multiple ChoiceBeginner
[Kubernetes] Init containers Smallest deployable unit
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Role Role-Based Access Control
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] ClusterRole Role-Based Access Control
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] RoleBinding Role-Based Access Control
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Least privilege Role-Based Access Control
qak8sk8sqa - Multiple ChoiceHard
[Kubernetes] Aggregation Role-Based Access Control
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Opaque Sensitive data
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] dockerconfigjson Sensitive data
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] TLS Sensitive data
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Base64 encoded Sensitive data
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Immutable Sensitive data
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] ClusterIP Network abstraction for pods
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] NodePort Network abstraction for pods
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] LoadBalancer Network abstraction for pods
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] Headless Network abstraction for pods
qak8sk8sqa - Multiple ChoiceIntermediate
[Kubernetes] ExternalName Network abstraction for pods
qak8sk8sqa - Multiple ChoiceHard
[Linux] CPU Resource limits for processes
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] Memory Resource limits for processes
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] IO Resource limits for processes
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] PIDs Resource limits for processes
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] Hierarchy Resource limits for processes
qalinuxlinuxqa - 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 ChoiceHard
[Linux] ip addr Network stack tools
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] ss Network stack tools
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] iptables/nftables Network stack tools
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] tcpdump Network stack tools
qalinuxlinuxqa - Multiple ChoiceHard
[Linux] SO_REUSEPORT Network stack tools
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] chmod rwx and ownership
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] chown rwx and ownership
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] umask rwx and ownership
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] SUID rwx and ownership
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] Sticky bit rwx and ownership
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] | Chain commands
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] 2>&1 Chain commands
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] /dev/null Chain commands
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] tee Chain commands
qalinuxlinuxqa - Multiple ChoiceBeginner
[Linux] xargs Chain commands
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 — 2-minute matches, Elo ranking, and badge tiers on the line.