THE GAME
Screenshots
Master system design concepts through interactive, arcade-style games. Learn caching, databases, sharding, load balancing, and more — by playing.
by Hyperfocused Engineer
System design interviews are notoriously hard to prepare for. Most resources are either dense walls of text, hour-long lecture videos, or expensive courses. I wanted to learn by doing.
So I built an arcade-style mobile game where each level teaches a system design concept through interactive challenges. No passive reading — you make decisions, see consequences, and build intuition through gameplay.
Play as a guest, or sign in with Google or Apple to sync your progress across devices. No ads. No paywalls. Free on iOS and Android.
Curated, chapter-based path from fundamentals to real systems. No guessing what to learn next — just press Continue.
21 games on caching, databases, sharding, CAP, replication, load balancing, rate limiting, consistent hashing, and more.
17 classic interview problems — URL Shortener, Chat System, Instagram, YouTube, Uber, Ticketmaster, Dropbox, and more.
10 tool deep-dives — Redis, Kafka, PostgreSQL, Elasticsearch, Kubernetes, Docker, Temporal, Zookeeper, Cloudflare, Grafana.
Capstone narratives — design a full system end-to-end from requirements to tradeoffs, the way an interview actually flows.
One fresh question every day. Keep your streak alive between study sessions.
Four tracks — Concept, Problem, Tool, and Story — covering the full system design interview surface area.
A chapter-by-chapter curated path. Fundamentals first, then real systems, then capstones.
One fresh challenge every day. Build a streak, keep concepts top of mind between sessions.
End-to-end narrative design games. Walk through requirements, tradeoffs, and architecture like a real interview.
Train reasoning, not just recall. Every level asks you to justify the choice behind the choice.
Interactive diagrams. Snap together clients, servers, caches, queues, and databases to prove you understand the flow.
Five dials to tune the look — background mode, glow intensity, gradients, and fonts. Dark neon by default.
Text-to-speech on every explanation. Learn while commuting, walking, or on the treadmill.
Sign in with Google or Apple to sync scores and progress across every device. Play guest-only if you prefer.
First-class layouts for iPad and Android tablets. Study at a desk, not squinting at a phone.
No ads, no third-party trackers. Minimal anonymous analytics for crash reporting, full account deletion in Settings.
Zero cost. No paywalls, no subscriptions, no “premium track.” Just open it and learn.
Additional end-to-end design narratives for popular interview problems. The current three are just the start.
Timed, multi-round runs that simulate the pressure of a real 45-minute interview slot.
Level 2–5 expansions for the existing tool games, plus new deep-dives on widely-used infrastructure.
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