Methodology and licenses
WORLDPRINT generates static content artifacts at build time. Gameplay uses one explicit reference year per indicator and excludes World Bank aggregate pseudo-countries.
The basemap comes from Natural Earth Admin 0 1:110m geometry. Indicator values come from the official World Bank Indicators API, then ship as same-origin static JSON. The live game does not call World Bank at runtime.
Permitted under Natural Earth public-domain terms.
Natural Earth public-domain vector data may be redistributed; attribution is requested.
Generally permitted under CC BY 4.0; metadata must be reviewed for third-party exceptions.
Redistribution requires attribution and respect for indicator-specific third-party notices.
Version 2026.06.19-ed1. The generated indicator bank contains 56 approved indicators. Daily manifests are pre-generated for the current static archive window so old archive pages do not reshuffle when the player opens them later.
Each indicator uses the most recent single reference year that reaches the coverage threshold against the game's mapped country registry. WORLDPRINT never mixes each country's individually latest value into one unlabeled map.
Missing values usually mean the provider did not publish a finite value for that country in the selected year, or the Natural Earth entity is outside the World Bank country registry used for this milestone. Missing countries are hatched on the map and never treated as zero.
Raw totals often reward knowing which countries are biggest. WORLDPRINT prioritizes rates, shares, percentages, and per-person measures because they create fairer visual puzzles about structure, not just scale.
The data build computes Pearson correlation, Spearman rank correlation, overlap counts, missing-data diagnostics, and visual-similarity warnings across approved indicators. Close distractors are useful on higher tiers, but very high correlations are flagged so Daily selection can avoid unfairly ambiguous combinations.
A World Bank indicator can be source-valid without being good Daily material. WORLDPRINT now gives each indicator an editorial status: Daily eligible, Practice only, Expert only, Needs review, or Retired. Daily eligible maps need strong visual patterns, clear units, good coverage, and plausible-but-fair distractors.
Current editorial status counts: daily_eligible: 28, expert_only: 15, needs_review: 3, practice_eligible: 8, retired: 2. Practice-only maps are still useful but less ideal for the main Daily. Expert-only maps are subtle or technical and appear only when the player asks for expert map difficulty. Needs-review and retired maps remain visible in internal QA but are excluded from new Daily manifests and Practice sets.
Retired indicators are not fake or unsupported; they simply make weaker puzzles. Some are near-duplicates of better maps, some are too ambiguous, and some depend on definitions that are not satisfying to infer from an unlabeled map.
This milestone uses a placeholder correction channel: report the indicator code, country, date, and source concern in the project issue tracker or product feedback channel. Future releases should add a public correction form and reviewed change log.
The current catalog is static, country-level, and World Bank focused. It does not include subnational variation, disputed border quizzes, cloud-synced results, public leaderboards, or non-World Bank providers yet.
WORLDPRINT stores no sensitive personal information and includes no trackers or analytics in this milestone.