PLAY FOUNDATION / APU023
Every current challenge is compiled from APU evidence. If the evidence does not support an answer, “insufficient evidence” can be correct.
01 / CHALLENGE DECK
Choose an answer, then reveal the evidence. No JavaScript, account, or persistent state is required.
Evidence-backed answer: Fixture Blue Brick
The answer is the to endpoint of apu:rel:tower-material; no other relationship is inferred.
Evidence state: Explicit · Relationships: apu:rel:tower-material · Time events: none · Sources: apu:source:apu001-fixture-spec
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
Evidence-backed answer: Fixture Observation Tower
The current deterministic graph path traverses apu:rel:hall-part-tower then apu:rel:tower-material. A path is not a new causal claim.
Evidence state: Derived From Explicit · Relationships: apu:rel:hall-part-tower, apu:rel:tower-material · Time events: none · Sources: apu:source:apu001-fixture-spec
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
Evidence-backed answer: Construction started — 1961 (fixture) → Completed — 1964 (fixture) → Altered — 1990s (fixture)
The sequence is sorted from the existing APU Time event dates while preserving their original precision.
Evidence state: Derived From Explicit · Relationships: none · Time events: apu:timeline:fixture-tower-construction-started, apu:timeline:fixture-observation-tower-completed-01, apu:timeline:fixture-tower-alteration · Sources: apu:source:apu001-fixture-spec
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
Evidence-backed answer: Fixture Observation Tower
Current entity evidence records Height 84.5 m. Missing measurements on other candidates are not treated as zero.
Evidence state: Explicit · Relationships: none · Time events: none · Sources: apu:source:apu001-fixture-measurements
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
Evidence-backed answer: Fixture Civic Square
The Atlas record explicitly marks this entity mapPointEligible=true with public exposure. Coordinates are intentionally omitted from Play.
Evidence state: Explicit · Relationships: none · Time events: none · Sources: apu:source:apu001-fixture-spec
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
Evidence-backed answer: Decade
APU Time stores this event as 1990s (fixture) with Decade precision; Play does not upgrade it.
Evidence state: Explicit · Relationships: none · Time events: apu:timeline:fixture-tower-alteration · Sources: apu:source:apu001-fixture-spec
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
Evidence-backed answer: Insufficient evidence in current APU graph
The current APU graph contains a style relationship but no explicit influence assertion. Style membership is not converted into causality.
Evidence state: Insufficient Evidence · Relationships: apu:rel:tower-style-ribbed · Time events: none · Sources: apu:source:apu001-fixture-spec
Self-score: +1 educational point if your selection matched. Evidence confidence is not part of the score.
02 / SCORING FIREWALL
A score measures only how many current exercise answers you matched. It says nothing about architectural quality, importance, source quality, or confidence.
No loot boxes, gambling mechanics, public ranking, manipulative streaks, or portable achievement system are implemented.
03 / UNCERTAINTY
The fixture influence challenge deliberately rewards refusing to turn a style relationship into causality. Unknown is a valid learning outcome, not a failure to fill a game slot.
04 / ACCESSIBLE ANSWER LEDGER
The ledger preserves answer type, evidence state, stable evidence identifiers, source identifiers, and the fixed educational score.
| Challenge | Type | Answer | Evidence state | Evidence IDs | Sources | Points |
|---|---|---|---|---|---|---|
| apu:play:relationship-endpoint | Relationship Endpoint | Fixture Blue Brick | Explicit | apu:rel:tower-material | apu:source:apu001-fixture-spec | 1 |
| apu:play:path-middle-node | Path Middle Node | Fixture Observation Tower | Derived From Explicit | apu:rel:hall-part-tower, apu:rel:tower-material | apu:source:apu001-fixture-spec | 1 |
| apu:play:timeline-sequence | Timeline Sequence | Construction started — 1961 (fixture) → Completed — 1964 (fixture) → Altered — 1990s (fixture) | Derived From Explicit | apu:timeline:fixture-tower-construction-started, apu:timeline:fixture-observation-tower-completed-01, apu:timeline:fixture-tower-alteration | apu:source:apu001-fixture-spec | 1 |
| apu:play:measurement-kind | Measurement Kind | Fixture Observation Tower | Explicit | apu:structure:fixture-observation-tower | apu:source:apu001-fixture-measurements | 1 |
| apu:play:atlas-eligibility | Atlas Eligibility | Fixture Civic Square | Explicit | apu:place:fixture-civic-square | apu:source:apu001-fixture-spec | 1 |
| apu:play:date-precision | Date Precision | Decade | Explicit | apu:timeline:fixture-tower-alteration | apu:source:apu001-fixture-spec | 1 |
| apu:play:influence-evidence | Evidence State | Insufficient evidence in current APU graph | Insufficient Evidence | apu:rel:tower-style-ribbed | apu:source:apu001-fixture-spec | 1 |
05 / ICU SEAMS
Accounts, Save, analytics, achievements, persistence, publication, and SEO remain ICU-owned. This portable branch stores no user progress and performs zero canonical writes.