WHY IT WORKS
flashkube is built on a handful of findings from the study of memory that have held up for decades and across hundreds of experiments. None of them are ours. What is ours is a game that does what they say — and, where the exam is hands-on, grades the way the exam grades.
1. BEING TESTED BEATS RE-READING
In a 2006 experiment, students who took a recall test after studying a passage remembered more of it a week later than students who spent the same time re-reading — even though the re-readers felt more confident at the time. A 2013 review of ten common study techniques rated practice testing as high utility and re-reading and highlighting as low.
in the game · Every card is a test. There is no reading mode: the answer is asked for before it is shown, and the daily voyage is dealt from the cards you are about to forget rather than the ones you know.
- Test-Enhanced Learning: Taking Memory Tests Improves Long-Term Retention · Psychological Science, 2006
- Improving Students' Learning With Effective Learning Techniques · Psychological Science in the Public Interest, 2013
2. SPACING BEATS CRAMMING, AND THE GAP CAN BE SCHEDULED
A 2006 synthesis of more than two hundred studies found that practice spread over time is remembered better than the same practice massed together, and that the best gap grows with how long you need to remember. Forgetting follows a curve steep enough to model, which is what makes the gap schedulable.
in the game · FSRS, an open-source scheduler, fits a forgetting model to your own reviews and names the day each card comes back. An exam date tightens the retention target as it nears, and the readiness page shows predicted recall on that day, per domain.
- Distributed Practice in Verbal Recall Tasks: A Review and Quantitative Synthesis · Psychological Bulletin, 2006
3. PRODUCING THE ANSWER BEATS RECOGNISING IT
A 2007 study compared short-answer and multiple-choice tests on the same material. With feedback, the short-answer tests produced better retention on a final test in either format — recalling an answer strengthens it more than picking it out.
in the game · On the hands-on cartridges, commands are typed past the first island, and the whole line counts: aliases, flags and their order. Multiple choice is kept for the written exams, where recognising the right statement is what the exam asks.
- Test format and corrective feedback modify the effect of testing on long-term retention · European Journal of Cognitive Psychology, 2007
4. PRACTICE THAT MATCHES THE TEST TRANSFERS
Experiments published in 1977 showed that memory is best when the way you practised matches the way you are tested — a principle since named transfer-appropriate processing. The hands-on exams grade the cluster they find, not the command you typed to get there.
in the game · Task chains put you at a terminal against a simulated cluster and grade the state it ends in, whatever the spelling. A miss carries on to the next step, looking is free, and the mock run lets you flag a task and come back — the shape of the real sitting.
- Levels of processing versus transfer appropriate processing · Journal of Verbal Learning and Verbal Behavior, 1977
5. FEEDBACK AFTER AN ERROR IS WHAT FIXES IT
A 2005 study found that showing the correct answer after an error is what improves later recall; telling people only that they were wrong did little, and feedback after a correct answer added almost nothing. The error is the moment the correction lands.
in the game · A miss shows the answer, the line you typed, the terminal's own output and how far off you were — "close: missing -n prod". On the cartridge, the Bosun explains the specific mistake and what it would cost in production.
- When Does Feedback Facilitate Learning of Words? · Journal of Experimental Psychology: Learning, Memory, and Cognition, 2005
A DEADLINE YOU CAN SEE, AND PEOPLE WHO CAN SEE IT
A 2002 study found that people who set themselves binding deadlines performed better than people left to their own pace — and that evenly spaced deadlines set for them did better still. Commitment works when it is concrete and visible. A widely repeated pair of percentages about accountability partners has no traceable study behind it, so it is not on this page.
in the game · An exam date turns the scheduler into a countdown. A crew shares one chart: every member's scores are on the crew's board, and the readiness board lets an admin see where each person stands by exam domain — progress made visible, not policed.
- Procrastination, Deadlines, and Performance: Self-Control by Precommitment · Psychological Science, 2002
WHAT THIS PAGE DOES NOT CLAIM
Nothing here is a pass rate. We do not have that data yet and we will not invent it. The one number the game shows about your future is predicted recall on exam day, and it is a forecast from your own reviews, not a promise about the exam.