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+# Pikachu Onet Connect — Design Spec
+
+## Overview
+
+A browser-based Pikachu Onet Connect tile-matching game built with React 18 + Vite + Phaser 3 + TypeScript. Players match pairs of identical emoji tiles by connecting them with a path of at most 3 straight line segments (2 bends). The game features multiple difficulty levels, a countdown timer, scoring, hints, and shuffle.
+
+## Tech Stack
+
+- **React 18** — shell UI (menus, HUD, game over screen)
+- **Vite** — build tool and dev server
+- **Phaser 3** — game board rendering, animations, tile interaction
+- **TypeScript** — entire codebase
+
+## Architecture
+
+### Layers
+
+- **React layer**: Main menu, difficulty selector, HUD (timer, score, hints, shuffles, pause), game over screen
+- **Phaser layer**: Game board rendering inside a React component via a `<div>` ref. Handles tile rendering, selection, matching animations, and line-drawing.
+- **Bridge**: A shared game state manager (plain TypeScript class with EventEmitter pattern) that both React and Phaser read/write to.
+
+### Directory Structure
+
+```
+src/
+  components/       # React UI (Menu, HUD, GameOver, DifficultySelect)
+  phaser/
+    scenes/         # Phaser scenes (GameScene, PreloadScene)
+    objects/        # Tile game object, line graphics
+  game/
+    board.ts        # Board generation, tile placement logic
+    pathfinder.ts   # Connection validation (<=3 line segments)
+    state.ts        # Shared game state manager
+  types/            # TypeScript types
+```
+
+## Game Mechanics
+
+### Board & Tiles
+
+- Grid of emoji tiles; each cell holds one emoji from a set of 20+ visually distinct emoji (animals, fruits, objects).
+- Tiles are placed in pairs — every emoji appears an even number of times.
+- Board sizes by difficulty:
+  - Easy: 6x4 (24 tiles, 12 pairs)
+  - Medium: 8x6 (48 tiles, 24 pairs)
+  - Hard: 10x8 (80 tiles, 40 pairs)
+- Board is surrounded by an invisible empty border (1 cell thick) to allow connections that route around the edges.
+
+### Matching Rules
+
+- Player clicks two identical tiles.
+- A valid connection must link them with a path of **at most 3 straight line segments** (at most 2 bends).
+- The path can only travel through empty cells (cleared tiles or the border).
+- If valid: tiles are removed, connecting line is briefly drawn, score increases.
+- If invalid: brief shake animation, no penalty.
+
+### Pathfinding Algorithm
+
+- Input: grid state, tile A coordinates, tile B coordinates.
+- Approach: for each empty cell reachable in a straight line from A, check if B is reachable from that cell in 1 more turn or less (direct or one bend).
+- Optimization: early exit on direct line match, skip impossible directions.
+- Returns: array of point coordinates forming the path, or `null`.
+
+### Win/Lose Conditions
+
+- **Win**: All tiles cleared before timer runs out.
+- **Lose**: Timer expires with tiles remaining.
+- **No valid moves**: Auto-shuffle remaining tiles with a toast notification (unlimited auto-shuffles).
+
+## Features
+
+### Timer
+
+- Countdown per difficulty:
+  - Easy: 5 minutes
+  - Medium: 4 minutes
+  - Hard: 3 minutes
+
+### Scoring
+
+- Base points per match: 100
+- Speed bonus: bonus points based on time remaining between matches
+- Combo multiplier: consecutive matches without mistakes increase the multiplier
+
+### Hint System
+
+- Button in HUD; highlights one valid pair by briefly pulsing the two tiles.
+- Limited uses by difficulty:
+  - Easy: 5 hints
+  - Medium: 3 hints
+  - Hard: 1 hint
+- Remaining hint count displayed in HUD.
+
+### Shuffle
+
+- Button to randomize positions of all remaining tiles.
+- Limited uses by difficulty:
+  - Easy: 3 shuffles
+  - Medium: 2 shuffles
+  - Hard: 1 shuffle
+- Auto-triggered (unlimited) when no valid moves exist, with a toast notification.
+
+## UI Flow
+
+```
+Main Menu -> Difficulty Select -> Game (with HUD) -> Game Over (win/lose)
+                                                   -> Play Again / Back to Menu
+```
+
+### HUD Layout (top bar)
+
+`[Timer] [Score] [Hints remaining: button] [Shuffles remaining: button] [Pause]`
+
+### Game Over Screen
+
+- Shows win/lose status, final score, time taken.
+- "Play Again" (same difficulty) and "Menu" buttons.
+
+## Animations (Phaser)
+
+- **Tile select**: scale bounce + glow
+- **Match found**: draw connecting line (fades out), tiles pop/fade out
+- **Invalid match**: brief shake
+- **Hint**: pulsing highlight on two tiles
+
+## Phaser-React Integration
+
+- A `GameContainer` React component creates a `<div ref>` and initializes Phaser in `useEffect` with cleanup on unmount.
+- Phaser game instance created with `Phaser.AUTO` renderer (WebGL with Canvas fallback).
+- Communication:
+  - Phaser scenes emit events (`match-found`, `game-over`, etc.) -> React listens via shared state manager -> updates HUD.
+  - React dispatches actions (`hint`, `shuffle`, `pause`) -> Phaser scene listens and responds.
+
+## Shared State Manager (`state.ts`)
+
+- Plain TypeScript class using an EventEmitter pattern.
+- Holds: score, timer, hints remaining, shuffles remaining, game status.
+- Both React and Phaser subscribe to changes.
+- Single source of truth to avoid sync bugs.
+
+## Board Generation (`board.ts`)
+
+- Pick N/2 unique emoji from the pool, duplicate each to form N tiles.
+- Fisher-Yates shuffle.
+- Place into 2D grid.
+- Validate that at least one valid move exists; if not, reshuffle.
+
+## Emoji Set
+
+- Array of 20+ distinct, visually distinguishable emoji.
+- Each difficulty uses a subset: Easy 12, Medium 24, Hard 40.