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
4,318 challenges matching your filters
- Multiple ChoiceHard
DNS Tunneling
cybersechard - Multiple ChoiceBeginner
Firewall: Basic Function
cybersecbeginner - Multiple ChoiceBeginner
Ping Command
cybersecbeginner - Multiple ChoiceBeginner
Private IP Range
cybersecbeginner - Multiple ChoiceBeginner
IPv4 vs IPv6
cybersecbeginner - Multiple ChoiceIntermediate
Load Balancer
cybersecintermediate - Multiple ChoiceBeginner
Localhost IP
cybersecbeginner - Multiple ChoiceBeginner
MAC Address
cybersecbeginner - Multiple ChoiceIntermediate
MITM Attack
cybersecintermediate - Multiple ChoiceBeginner
NAT: Purpose
cybersecbeginner - Multiple ChoiceBeginner
OSI: Layer 2
cybersecbeginner - Multiple ChoiceBeginner
OSI: Layer 3
cybersecbeginner - Multiple ChoiceBeginner
OSI: Layer 4
cybersecbeginner - Multiple ChoiceBeginner
OSI: Layer 7
cybersecbeginner - Multiple ChoiceBeginner
OSI Model: Layers
cybersecbeginner - Multiple ChoiceBeginner
DNS Port
cybersecbeginner - Multiple ChoiceBeginner
FTP Ports
cybersecbeginner - Multiple ChoiceBeginner
Default Port: HTTP
cybersecbeginner - Multiple ChoiceBeginner
Default Port: HTTPS
cybersecbeginner - Multiple ChoiceBeginner
RDP Port
cybersecbeginner - Multiple ChoiceBeginner
SMTP Port
cybersecbeginner - Multiple ChoiceBeginner
Default Port: SSH
cybersecbeginner - Multiple ChoiceIntermediate
Forward Proxy
cybersecintermediate - Multiple ChoiceIntermediate
Reverse Proxy
cybersecintermediate - Multiple ChoiceBeginner
Router: Function
cybersecbeginner - Multiple ChoiceIntermediate
SNMP
cybersecintermediate - Multiple ChoiceBeginner
SSL vs TLS
cybersecbeginner - Multiple ChoiceBeginner
Subnet Mask
cybersecbeginner - Multiple ChoiceIntermediate
TCP Flags
cybersecintermediate - Multiple ChoiceIntermediate
TCP 3-Way Handshake
cybersecintermediate - Multiple ChoiceBeginner
TCP vs UDP
cybersecbeginner - Multiple ChoiceBeginner
Telnet vs SSH
cybersecbeginner - Multiple ChoiceIntermediate
UDP Properties
cybersecintermediate - Multiple ChoiceHard
VLAN Hopping
cybersechard - Multiple ChoiceBeginner
VPN: Purpose
cybersecbeginner - Multiple ChoiceBeginner
Recon: DNS Enum
cybersecbeginner - Multiple ChoiceBeginner
Recon: Port Scanning
cybersecbeginner - Multiple ChoiceBeginner
OSINT: Definition
cybersecbeginner - Multiple ChoiceBeginner
Social Engineering
cybersecbeginner - Multiple ChoiceBeginner
Recon: WHOIS
cybersecbeginner - Multiple ChoiceBeginner
Authentication Factors
cybersecbeginner - Multiple ChoiceBeginner
Blue Team
cybersecbeginner - Multiple ChoiceBeginner
CIA Triad: Components
cybersecbeginner - Multiple ChoiceBeginner
Defense in Depth
cybersecbeginner - Multiple ChoiceIntermediate
Cyber Kill Chain
cybersecintermediate - Multiple ChoiceBeginner
Least Privilege
cybersecbeginner - Multiple ChoiceBeginner
Multi-Factor Auth
cybersecbeginner - Multiple ChoiceIntermediate
MITRE ATT&CK
cybersecintermediate - Multiple ChoiceBeginner
Patch Management
cybersecbeginner - Multiple ChoiceBeginner
Penetration Testing
cybersecbeginner - Multiple ChoiceBeginner
Red Team
cybersecbeginner - Multiple ChoiceBeginner
Risk Management
cybersecbeginner - Multiple ChoiceBeginner
Security Audit
cybersecbeginner - Multiple ChoiceIntermediate
STRIDE Model
cybersecintermediate - Multiple ChoiceBeginner
Threat Modeling
cybersecbeginner - Multiple ChoiceBeginner
Vulnerability Scanning
cybersecbeginner - Multiple ChoiceBeginner
Zero Trust
cybersecbeginner - Multiple ChoiceIntermediate
API Key vs Token
cybersecintermediate - Multiple ChoiceIntermediate
API Rate Limiting
cybersecintermediate - Multiple ChoiceIntermediate
Brute Force Defense
cybersecintermediate
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.