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
447 challenges matching your filters
Clear topic filter- Multiple ChoiceHard
Memory leaks
frontendhard - Multiple ChoiceHard
Web Vitals TBT
frontendhard - Multiple ChoiceIntermediate
Compression
frontendintermediate - Multiple ChoiceIntermediate
HTTP/2 multiplexing
frontendintermediate - Multiple ChoiceIntermediate
3rd-party impact
frontendintermediate - Multiple ChoiceHard
Layout thrashing
frontendhard - Multiple ChoiceIntermediate
Performance budget
frontendintermediate - Multiple ChoiceHard
PRPL pattern
frontendhard - Multiple ChoiceIntermediate
Service Workers
frontendintermediate - Multiple ChoiceIntermediate
Web App Manifest
frontendintermediate - Multiple ChoiceHard
Cache API
frontendhard - Multiple ChoiceHard
Push notifications
frontendhard - Multiple ChoiceHard
Background Sync
frontendhard - Multiple ChoiceIntermediate
Offline-first
frontendintermediate - Multiple ChoiceIntermediate
Web Share API
frontendintermediate - Multiple ChoiceHard
Payment Request API
frontendhard - Multiple ChoiceHard
Credential Management
frontendhard - Multiple ChoiceHard
WebRTC
frontendhard - Multiple ChoiceIntermediate
Screen Wake Lock
frontendintermediate - Multiple ChoiceIntermediate
Device Orientation
frontendintermediate - Multiple ChoiceIntermediate
Battery Status
frontendintermediate - Multiple ChoiceIntermediate
Network Information
frontendintermediate - Multiple ChoiceHard
Web Bluetooth
frontendhard - Multiple ChoiceIntermediate
PWA install prompt
frontendintermediate - Multiple ChoiceHard
Workbox
frontendhard - Multiple ChoiceHard
Web Vitals in PWA
frontendhard - Multiple ChoiceBeginner
Media queries — Breakpoints
frontendbeginner - Multiple ChoiceIntermediate
Mobile-first — Progressive Enhancement
frontendintermediate - Multiple ChoiceIntermediate
Fluid typography
frontendintermediate - Multiple ChoiceIntermediate
Responsive images
frontendintermediate - Multiple ChoiceIntermediate
Viewport units
frontendintermediate - Multiple ChoiceIntermediate
Breakpoints
frontendintermediate - Multiple ChoiceHard
Container queries (128)
frontendhard - Multiple ChoiceIntermediate
Flexbox wrapping
frontendintermediate - Multiple ChoiceIntermediate
Grid auto-fit
frontendintermediate - Multiple ChoiceIntermediate
Responsive tables
frontendintermediate - Multiple ChoiceIntermediate
Picture element — Art Direction
frontendintermediate - Multiple ChoiceHard
min/max functions
frontendhard - Multiple ChoiceHard
Device pixel ratio
frontendhard - Multiple ChoiceIntermediate
Orientation
frontendintermediate - Multiple ChoiceIntermediate
Hover/pointer
frontendintermediate - Multiple ChoiceIntermediate
Responsive embeds
frontendintermediate - Multiple ChoiceIntermediate
Testing responsiveness
frontendintermediate - Multiple ChoiceHard
Intrinsic design
frontendhard - Multiple ChoiceIntermediate
React Router
frontendintermediate - Multiple ChoiceIntermediate
Next.js routing
frontendintermediate - Multiple ChoiceIntermediate
SPA vs MPA
frontendintermediate - Multiple ChoiceIntermediate
Hash vs History
frontendintermediate - Multiple ChoiceIntermediate
Dynamic routes
frontendintermediate - Multiple ChoiceIntermediate
Nested routes
frontendintermediate - Multiple ChoiceIntermediate
Route guards
frontendintermediate - Multiple ChoiceIntermediate
Lazy loading routes
frontendintermediate - Multiple ChoiceIntermediate
404 handling
frontendintermediate - Multiple ChoiceIntermediate
Navigation guards
frontendintermediate - Multiple ChoiceIntermediate
Query params
frontendintermediate - Multiple ChoiceIntermediate
Scroll restoration
frontendintermediate - Multiple ChoiceIntermediate
Link prefetching
frontendintermediate - Multiple ChoiceIntermediate
Breadcrumbs
frontendintermediate - Multiple ChoiceHard
SSR routing
frontendhard - Multiple ChoiceBeginner
useState
frontendbeginner
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.