FLASHKUBE
A flashcard game for Kubernetes and its certifications. Spaced repetition under the hood: miss a card and it comes back sooner, answer it well and it rests.
Nobody gets home unchanged.
six islands between you and CKAD, and nineteen in the ocean around it. Helm has the wheel, the questions are the weather, and he is never going to explain the answer to you.
7 seas charted · 1 stack · 1 tool · 1083 cards
$29, once, and it is yours. The exams themselves run $200 to $445.
The game you play depends on how you are examined
one game per cartridge
CERTIFICATIONS$29 once · yours to keep
- Pod WreckGeneral — things fall, and you say why before they land.
- Pod HeadingCKAD — speed under a clock, so you hold a heading.
- Cluster SalvageCKA — admin is triage, so you salvage.
- Namespace BoardingCKS — it arrives in waves, so you hold the rail.
- Cluster CompassKCNA — you learn the water before the wheel, so you take a bearing.
- Secret WatchKCSA — you learn where the leaks are before you go below, so you keep the watch.
- Delta RapidsLakehouse — the region is a river, so you pilot it.
STACKSno exam · run in production · in the cartridge
- Operator ConvoyPlatform — no exam, only production, so you keep the convoy together.
TOOLSno exam · no season · in the cartridge
- FetchK9s — no exam at all, so it drills composure. Routes, par, strokes.
The Field Update — Endpoint Eddy, a networking landing for the CKA
new cartridge update
Straight from the exam's own bullet, troubleshoot services and networking: a Service that selects nothing, a targetPort that misses the container, CoreDNS scaled to zero, a default deny and the one rule that opens it. Graded on the cluster your commands leave behind, not on the spelling.
four task chains, graded on the cluster · september 2026
how it works
It learns your weak spots
It calls your bluffs
It keeps score
why this works — the research, cited →
plainly
What is flashkube?
flashkube is a flashcard game for Kubernetes certification. Miss a card and it comes back sooner; answer it well and it rests. That is spaced repetition, and it is the whole engine. It covers six certification exams — CKAD, CKA, CKS, KCNA, KCSA and the Databricks Certified Data Engineer Professional — each with its own page, and deals ten cards free with no account.
Which certification exams does it cover?
Hands-on exams: the Certified Kubernetes Application Developer (CKAD), Certified Kubernetes Administrator (CKA) and Certified Kubernetes Security Specialist (CKS). Multiple-choice exams: the Kubernetes and Cloud Native Associate (KCNA), Kubernetes and Cloud Native Security Associate (KCSA) and Databricks Certified Data Engineer Professional. Every card is tagged per exam; the mock exam, the Veteran Run and the demo hand are dealt by each exam's published domain weights, and the daily voyage is built from the cards you are about to forget.
Is it a practice exam, or a lab?
Neither. Every card is original study content weighted by the exam's published domains, never an exam question. Use a lab for the cluster. Use flashkube for everything you will forget between now and the exam — it is the other half of the same preparation, not a substitute for the first. Task chains put you at a terminal against a simulated cluster and grade the state it ends in.
How does the scheduling work?
FSRS, an open-source spaced-repetition scheduler, fits a forgetting model to your own reviews and names the day each card comes back. A miss returns sooner and a fast correct answer rests longer. Set an exam date and the retention target tightens as it nears; the readiness page shows predicted recall on that day, per exam domain.
What does it cost?
Three islands of free water, from wherever you land, and the ten-card demo, cost nothing. The Cert Cartridge is $29, paid once: it opens every exam at once, nothing renews, and every card added afterwards is included. Crews of five at $29 a month and twenty at $99 a month, billed to the crew, and every berth carries the full cartridge.