InfraSim: System Design Game

New: War Stories. Split brain, cache stampedes, missing indexes and more: five failures that are not in the interview, beside 61 campaign levels. No ads, no timers.

InfraSim is a system-design game you play with your thumbs.

Drag a load balancer, a cache, a database, and a queue onto the canvas. Wire them together. Hit deploy. Watch live traffic flow through the graph you built: latency, cost, and errors move because of what you designed, not a script.

Then something breaks. A traffic spike hits at the worst possible moment. A zone goes dark. A bot swarm hammers your login endpoint. You have seconds to find the bottleneck, fix it, and keep your users online, or watch the postmortem explain exactly what took you down.

No experience needed: the first chapter starts from a single server and adds one idea per level.

WHAT YOU'LL PLAY

• Interview Mode: four classic system design interview questions (URL Shortener, Chat App, News Feed, Photo Upload). Build your answer against real requirements, run it, and get an interviewer's feedback. Then the follow-up round changes the requirements and your design has to keep up
• A guided campaign, 61 levels across 13 chapters, from "single server" to "multi-region, cache-fronted, queue-buffered" architecture, one concept at a time
• Startup Survival: an endless run where incidents escalate until something gives
• Daily Challenge: one seeded scenario, one shot, a global leaderboard
• Sandbox: no rules, no scoring, just build whatever you want and watch it run
• A full encyclopedia of the concepts behind every service, plus a plain-English glossary, written for players who've never touched a terminal

HOW IT WORKS Every run is a real (simulated) system: aggregate traffic, queueing curves, capacity, cost, and failure all computed on your device from what you actually built. Nothing here is a quiz with a "correct" architecture, most levels have several viable designs with real trade-offs between cost, latency, and resilience.

Play the tutorial, 15 of the 61 campaign levels and the first URL Shortener interview round completely free, no account needed. Sign in only if you want your progress to follow you across devices and a spot on the Daily Challenge leaderboard.

InfraSim is an independent educational game. It is not affiliated with, endorsed by, or sponsored by Amazon Web Services, Microsoft, or Google. Provider names are used only to map generic architecture concepts onto terminology you may already recognise.

No ads. No loot boxes. No energy timers. Pro unlocks Interview Mode, the rest of the campaign, unlimited Survival runs, more Sandbox slots, and the full Daily Challenge archive: everything you've already played stays free forever.

SUBSCRIPTION InfraSim Pro is available as a monthly or annual auto-renewing subscription, or as a one-time lifetime unlock. Payment is charged to your Apple ID at confirmation of purchase. A subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. Manage or cancel any time in Settings > [your name] > Subscriptions.

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