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arXiv · 2607.03700

Content Hidden Behind Execution: Analyzing Public Scratch Projects at Runtime

Yuan Si·Yufeng Lin·Daming Li·Hanyuan Shi·Yang Shi·Jialu Zhang
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Abstract

Public Scratch projects are reused in computing education as classroom examples, remix sources, open-exploration materials, and research data. Curation often begins with titles, thumbnails, descriptions, tags, and remix links, but Scratch projects are executable learning artifacts. Content affecting age appropriateness can appear only after execution, gameplay progression, a failure state, user interaction, costume switching, audio playback, or a hidden event trigger. We study "runtime-revealed sensitive content" as a computing education curation challenge: educators and researchers need runtime evidence about what students may encounter when Scratch projects are used in these settings. We introduce a runtime-aware annotation scheme that separates content category, risk level, evidence channel, reveal mechanism, and annotation confidence. Using this scheme, we conducted an audit of 500 public Scratch projects sampled from curated candidates, taxonomy-guided keyword search, and follow-up exploration of project clusters surfaced during review. In this audit, 467 of 500 projects (93%) required runtime exploration beyond static metadata to surface the safety-relevant signal; 387 (77%) required interaction, gameplay progression, failure states, or hidden-asset and code inspection. As a targeted classroom and research curation audit, the study characterizes reveal mechanisms in a selected corpus rather than estimating platform-wide prevalence or making platform-level safety claims. The results show metadata-only screening leaves key evidence unresolved in executable youth media. By separating content type, severity, evidence location, and reveal pathway, this work supports classroom project selection, student exploration practices, dataset construction, and educator-facing screening tools for block-based programming communities.

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Yuan Si, Yufeng Lin, Daming Li, Hanyuan Shi, Yang Shi, Jialu Zhang. 2026-07-04. Content Hidden Behind Execution: Analyzing Public Scratch Projects at Runtime. https://arxiv.org/abs/2607.03700

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