# Dinosaur runner: recovering one acceleration rule

> REA’s documented teaching case inspects the HTTP t-rex-runner edition and reconstructs its speed-update rule. A separate controlled original-game check and a new demonstration compare update counts, including the floating-point step that crosses the nominal speed threshold.

- Type: Case study
- Targets: Game · Website
- Category: Official REA: case studies
- Relationship: Official REA case study
- Sources reviewed: 2026-10-17
- Added to the catalog: 2026-10-17
- Original resource: <https://github.com/morluto/rea/blob/c360cfcd6d7901514b16dd6113eba2e0b0fdf422/website/evidence/calculator-and-dino.md#dinosaur-speed>
- Primary source: <https://github.com/morluto/rea/blob/c360cfcd6d7901514b16dd6113eba2e0b0fdf422/website/evidence/calculator-and-dino.md>
- Catalog page: <https://awesomerea.org/resources/rea-dinosaur-speed-case/>
- Record JSON: <https://awesomerea.org/resources/rea-dinosaur-speed-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/rea-dinosaur-speed-case/index.md)

## Requirements & limits

- **Scope:** The recorded target is wayou’s HTTP browser edition at the cited revision, not chrome://dino/. Source and observation hashes identify that edition.
- **Attribution:** After read-only inspection, a separate Playwright controller disabled future scheduling and obstacles to call the original update function under controlled conditions.
- **Limits:** The reconstructed claim is limited to acceleration. Drawing, jumping, collisions and controls in the teaching game are newly authored, not independently recovered original gameplay.
- **Testing evidence:** Public result tables and code document the author’s checks. The cited original-source excerpts retain Chromium attribution and BSD-3-Clause terms.

## Primary sources

1. <https://github.com/morluto/rea/blob/c360cfcd6d7901514b16dd6113eba2e0b0fdf422/website/evidence/calculator-and-dino.md>
2. <https://github.com/morluto/rea/blob/c360cfcd6d7901514b16dd6113eba2e0b0fdf422/website/public/assets/licenses/dinosaur.txt>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.