the Eucalculia interlude · adaptive exposure · varied question forms · prototype v34
The core size scale is S · M · L · XL. Latin grids use numbers, colours, or shading patterns as their symbols. Every claim is judged from memory.
How to play
This prototype is one interlude of Eucalculia — a run of short blocks under the mask. Unlocking adds material to the repertoire instead of replacing what came before. Every block is capped at eight questions, but its actual ceiling is chosen from the estimated presentation cost: brief number flashes can use the full dose, while long sequential or evidence tasks usually stop at three to five. A nearly complete frontier packet may return for a one- or two-question completion tail; that is the only route below three. The eight-answer frontier criterion persists across short visits, so shortening a block never lowers the promotion standard. Earlier mastered material returns in shorter review doses; strong retention spaces it out, while errors bring it back sooner. Number opens as soon as the basics are mastered. Exposure adapts to you: it starts generous and shortens only while you keep answering right. Keys: ← / Y = yes · → / N = no · 1–4 = options · Esc = pause.
Track A · Load
Three rich objects as the rule, never more than five: attributes, positions, comparisons, bindings, sets, containers and pointing — negated frames from R3.
Track B · Arity
Sequences, qualified references, Latin grids, transformations of two pairs and closures over twins.
Track C · Number
Brief flashes: subsets by feature, kinds, comparisons and exact differences — never the bare total, which Eucalculia's own blocks train; total area is controlled.
Track D · Induction
A finite public grammar — alternations, quarter and half turns, texture and size cycles, side counts, two or three operations at every step — then hypothesis spaces, active tests, transfer to new dimensions, two-input gates and program equivalence.
Track E · Relational oddity
Four cards, one exception, one public explanation: relations, transformations, programs, gates and conditional counterexamples. Surface salience never counts by itself.
Track F · Evidence
Necessity is not truth: classify a claim as necessary, possible only or impossible (E0); then judge one named relation of five — critical, redundant or irrelevant (E1).
Track G · Verbal
Sentence verification (Baddeley; Clark and Chase): one sentence is the whole question — the order of two shapes (affirmed or negated, active or passive, «preceded», «followed», «before» or «after») or a change along the track (colour, texture, size: changed or stayed the same, from → to, increased or decreased) — then the marked comparative, the subject shift, no scaffold, translation, one reference point across clauses (Reichenbach) and tense anchoring. Normalise first, compare after.
Tools
Seed
Rung
Timing
encode ×multiplies exposure time on every rung
Data
Visual language
Standalone symbols only. The diamond, heart, spade and club reuse familiar suit signs; no playing-card faces, ranks or frames are introduced.
Audit (in-browser)
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Visual atlas
Shape vocabulary
Inspect the exact SVG primitives used by the game. Suit signs are standalone shapes, not cards. Use the controls to stress the smallest sizes, every texture and every valid orientation.