Godot Genre Puzzle

## Godot-Specific Tips

*   **Tweens**: Use `create_tween()` for all grid movements. It feels much better than instant snapping.
*   **Custom Resources**: Store level data (layout, starting positions) in `.tres` files for easy editing in the Inspector.
*   **Signals**: Use signals like `state_changed` to update UI/Visuals decoupled from the logic.

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## Reference

> Progressive disclosure: open Official Documentation links only when researching a specific API;
> load Related Skills when routing work to a peer domain — do not preload the whole lattice.

### Official Documentation
- [UndoRedo](https://docs.godotengine.org/en/stable/classes/class_undoredo.html) — Built-in action history for do/undo/redo so puzzle experimentation does not require a hand-rolled command stack.
- [AStarGrid2D](https://docs.godotengine.org/en/stable/classes/class_astargrid2d.html) — Uniform-grid pathfinding (`diagonal_mode`, `jumping_enabled`) for hints and reachability on Sokoban-style boards.
- [Tween](https://docs.godotengine.org/en/stable/classes/class_tween.html) — Interruptible `create_tween()` motion for cell-to-cell feedback while logical `Vector2i` state updates immediately.
- [Using TileMaps](https://docs.godotengine.org/en/stable/tutorials/2d/using_tilemaps.html) — TileMapLayer workflows for painting walls/targets while keeping puzzle truth in a separate grid dictionary.
- [Saving games](https://docs.godotengine.org/en/stable/tutorials/io/saving_games.html) — Persist level progress, stars, and mid-puzzle snapshots without relying on scene reload as save.
- [Using InputEvent](https://docs.godotengine.org/en/stable/tutorials/inputs/inputevent.html) — Device-agnostic click/drag/action routing for forgiving grid selection and move commits.
- [Resources](https://docs.godotengine.org/en/stable/tutorials/scripting/resources.html) — Store layouts and starting piece sets as `.tres`/`Resource` data editable in the Inspector.
- [Physics introduction](https://docs.godotengine.org/en/stable/tutorials/physics/physics_introduction.html) — RigidBody sleep, layers, and integration hooks for physics-driven puzzle pieces.
- [Idle and Physics Processing](https://docs.godotengine.org/en/stable/tutorials/scripting/idle_and_physics_processing.html) — Why win/soft-lock checks belong on move commits, not every `_process` frame.
- [Data preferences](https://docs.godotengine.org/en/stable/tutorials/best_practices/data_preferences.html) — Prefer integer grid keys (`Vector2i`) and explicit dictionaries over SceneTree-as-truth.
- [Runtime file loading and saving](https://docs.godotengine.org/en/stable/tutorials/io/runtime_file_loading_and_saving.html) — `FileAccess`/`user://` patterns for custom level JSON and editor export packs.
- [JSON](https://docs.godotengine.org/en/stable/classes/class_json.html) — Serialize compact puzzle boards when splitting `Vector2` fields for portable level files.

### Related Skills

#### Prerequisites
- [godot-input-handling](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-input-handling/SKILL.md) — Buffered InputEvent/action maps so grid clicks and directional moves stay device-agnostic and forgiving.
- [godot-signal-architecture](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-signal-architecture/SKILL.md) — Safe `state_changed` / `level_complete` wiring so UI and VFX stay decoupled from grid truth.
- [godot-project-foundations](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-project-foundations/SKILL.md) — Autoload/project layout baselines before stacking undo managers, savers, and level packs.

#### Complements
- [godot-tweening](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-tweening/SKILL.md) — Deeper Tween composition when cell moves, match clears, and resets need interruptible juice without logic races.
- [godot-save-load-systems](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-save-load-systems/SKILL.md) — Progress ownership, versioning, and threaded loads beyond per-level JSON snapshots.
- [godot-tilemap-mastery](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-tilemap-mastery/SKILL.md) — TileMapLayer painting, custom data, and terrain patterns that visualize walls while scripts own solvability.
- [godot-navigation-pathfinding](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-navigation-pathfinding/SKILL.md) — Broader Navigation/A* stacks when puzzle hints outgrow a single `AStarGrid2D` region.
- [godot-2d-physics](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-2d-physics/SKILL.md) — RigidBody sleep, layers, and queries for physics puzzles that still need deterministic settle/win checks.
- [godot-state-machine-advanced](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-state-machine-advanced/SKILL.md) — Phase FSMs (observe → move → resolve → win) when puzzles mix animation locks with input gates.
- [godot-camera-systems](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-camera-systems/SKILL.md) — Camera2D/3D framing and unproject helpers for perspective/world-space puzzle overlays.
- [godot-ui-containers](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-ui-containers/SKILL.md) — Minimal undo/reset HUD layouts that stay non-intrusive during non-verbal tutorials.

#### Downstream / consumers
- [godot-monte-carlo-balancer](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-monte-carlo-balancer/SKILL.md) — Sample solvability, move-count distributions, and soft-lock rates so level packs stay fair as mechanics combine.
- [godot-procedural-generation](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-procedural-generation/SKILL.md) — Generate candidate boards that still pass this skill's validators, undo constraints, and win-condition contracts.
- [godot-genre-roguelike](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-genre-roguelike/SKILL.md) — Consumes grid/undo patterns when dungeon runs embed discrete puzzle rooms or locked-door logic.

#### Master
- [godot-master](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-master/SKILL.md) — Library router and mirrored module entry for discovering this genre skill beside sibling domains.