# A* pathfinding explained visually

> An illustrated pathfinding explainer pairs readable prose and color-coded code with terrain maps, graph overlays, directional grids, step controls, and side-by-side comparisons of search coverage.

- Kind: Interactive reference
- Live interactive reference: https://www.redblobgames.com/pathfinding/a-star/introduction.html
- Page: https://meetreference.com/v/exp-astar-pathfinding/
- Ready-to-use agent handoff: https://meetreference.com/v/exp-astar-pathfinding/agent.txt
- Authorship: Not stated
- Made with: Not stated
- Model: not stated
- Built with: not stated
- Style: Interactive explainers; educational, interactive diagrams, grid maps, color coding, editorial, algorithm visualization
- Preview: a flip-through of inspected screenshots; open the live work to experience its motion and interactions.
- Shared by Red Blob Games in Website, May 26, 2014: https://www.redblobgames.com/pathfinding/a-star/introduction.html
- Prompt fidelity: Unavailable in this entry. The recreation brief is written by Reference.

## Before you start

Guidance from Reference, separate from the creator's instructions.

1. Read the reference and inspect the project, installed libraries, and available agent skills before writing code. Reuse suitable tools already present.
2. Prefer the creator-reported libraries and skills when they fit the task. Explain what useful additions help with, and install missing project dependencies or relevant skills from official sources when the environment and the user's existing permissions allow it. Respect the project's package manager and setup rules; do not ask again for routine setup already authorized.
3. Distinguish tools used by the creator from your own recommendations. A listed tool is not automatically required, and an empty tools or requirements list means the setup is unknown, not that nothing is needed.
4. Ask concise questions when missing inputs or choices materially affect the result: paid services, credentials, the user's assets, or a different production approach. Use existing answers and permissions; continue independent work while waiting.
5. If a useful library, skill, or service cannot be installed or used, explain an available alternative and its expected effect on quality, features, or effort. Get the user's choice before a material compromise; otherwise state the fallback and continue. Never silently simplify the result or claim to have used a tool you did not use.

## Recreating this interactive reference

This is a visual reference. No original creator prompt is available. The following brief was written by Reference after inspecting the work.

Reuse the same endpoint shapes and semantic colors in prose, code, and diagrams so readers can trace a concept across representations. Layer a simplified node-and-edge graph over a recognizable scene, then reduce it to a grid with arrows and a contrasting route. Compare alternatives on identically sized grids, and highlight only the changed code terms. For a new subject, replace the terrain, symbols, and algorithm states while retaining this progression from concrete scene to abstract model to comparison.

1. Open the live work or source and inspect the frame images below.
2. Adapt its layout, hierarchy, palette, and interaction patterns to the user's own content and brand.
3. Compare the result against the reference. Use your own assets and credit the original creator.

## What it looks like

Written by Reference from the captured walkthrough frames, not by the creator.

Tutorial page introducing A* and related pathfinding concepts, illustrated with maps, grid diagrams, and code examples.

- Color: White and light gray backgrounds with dark red headers, green map areas, and blue, purple, and red diagram details.
- Type: Bold sans-serif headings, serif article text and syntax-colored monospace code.
- Framing: A narrow centered article column with broad white margins; maps, code and paired comparison diagrams align with the reading flow.
- Structure: Repeated site header above article text, diagrams, and code blocks, with dark red section-heading bars separating topics.

Storyboard, nine frames spread across the captured walkthrough: https://meetreference.com/media/exp-astar-pathfinding/storyboard.webp

- Frame 1 at 1.2s: https://meetreference.com/media/exp-astar-pathfinding/f1.webp
- Frame 2 at 3.7s: https://meetreference.com/media/exp-astar-pathfinding/f2.webp
- Frame 3 at 6.2s: https://meetreference.com/media/exp-astar-pathfinding/f3.webp
- Frame 4 at 8.7s: https://meetreference.com/media/exp-astar-pathfinding/f4.webp
- Frame 5 at 11.2s: https://meetreference.com/media/exp-astar-pathfinding/f5.webp
- Frame 6 at 13.7s: https://meetreference.com/media/exp-astar-pathfinding/f6.webp
- Frame 7 at 16.2s: https://meetreference.com/media/exp-astar-pathfinding/f7.webp
- Frame 8 at 18.7s: https://meetreference.com/media/exp-astar-pathfinding/f8.webp
- Frame 9 at 21.2s: https://meetreference.com/media/exp-astar-pathfinding/f9.webp

## Links

- Open reference: https://www.redblobgames.com/pathfinding/a-star/introduction.html
- Original post: https://www.redblobgames.com/pathfinding/a-star/introduction.html