What it solves
Exam preparation typically degenerates into one of two bad modes: rereading (feels productive, teaches nothing) or panic-cramming (teaches briefly, then collapses). Both avoid the thing that actually builds durable memory — the struggle of trying to retrieve without support.
Fog of War makes that struggle the default state of your canvas.
How it works
Seven to fourteen days before an exam, you activate Fog of War on the canvas region you want to test. The zone is masked — a semi-opaque blur that hides content until you either retrieve it from memory or explicitly reveal it.
Navigate your canvas. Stop at a masked node. Try to remember what was there. Speak it aloud or write it on a companion surface. Only then tap to reveal.
Three outcomes:
- Green — you retrieved it correctly. The mask thins permanently.
- Amber — you got it partially. The mask becomes transparent but the node stays highlighted for revisit.
- Red — you missed it entirely. Fluera schedules an immediate return and prompts you to rewrite the node by hand — reinforcing via generation, not re-reading.
Run the loop until most of the canvas shifts to green. What remains red is the map of what you don’t know — exactly the map you needed.
The science behind it
Robert Bjork’s desirable difficulties framework is the load-bearing idea. Fluency during study is a bad signal — a warning that encoding is shallow. The friction of retrieval under occlusion is the opposite: unfluent, slow, frustrating and exactly what cements memory.
Roediger and Karpicke’s 2006 work showed that a single retrieval attempt produces stronger long-term retention than four rereading sessions. Fog of War is retrieval attempts at scale, across your entire canvas, without cost-per-question friction.
The spatial element matters too. Because your canvas is a memory palace (O’Keefe & Moser, Nobel 2014), retrieving from position reinforces not just the concept but the spatial index that leads to it. In the exam, you don’t recall the fact — you navigate to it.
What’s coming
- Automatic mask scheduling — FSRS-driven fog that thickens on items due for review.
- Timed exam simulation — realistic pressure with configurable constraints.
- Post-mortem map — after the real exam, annotate which questions you aced and which you missed, and let Fluera update the scheduler with that ground truth.