Learn the concept, then fix a live outage by typing the real commands, then walk into your DevOps or SRE interview knowing exactly why. Beginner to Expert.
No signup. Runs in your browser, on desktop or phone. First 3 incidents and every Learn concept are free.
Every level is a production incident. You don't pick A, B, C or D. You type the command, then explain the root cause.
A plain definition, the commands to know and real interview questions with model answers. Free for everyone.
Get the alert, run through the server farm, open four terminals: find the cause, apply the fix, verify it. Wrong commands teach you why.
Each level ends with a root-cause debrief and a runbook cheat sheet of the commands to remember.
Disk, memory, CPU, permissions, networking, firewalls, SSH and more, grouped into three tiers. New incidents are added regularly, and more worlds (Docker, Kubernetes, CI/CD, Terraform, AWS) are on the way.
One payment. Your license key is emailed right after.
A free library of concept cards: a plain definition, key points, the commands to know and interview questions with model answers. Read a concept, then practise the matching incident.
No. The terminals are simulated, so there's nothing to install and nothing can break. But the commands, flags and outputs are the real ones you'd use on-call.
Yes. There are on-screen controls and a touch keyboard for the terminals. A laptop is more comfortable for typing.
After payment your license key is emailed to you. Open the game, click "Unlock all levels" and paste it. Your progress is saved in your browser.
One license key works on one device at a time. If you get a new laptop or phone, you can move your key yourself (up to 2 times) from the Unlock box. Your key is saved on the device you paid on.
Anyone preparing for DevOps, SRE, sysadmin or cloud interviews, and new engineers who want on-call practice.
Reply to your receipt email and we'll sort it out.