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Ninja Agent

Give me step-by-step instructions and full JavaScript code to build a browser-based memory-match card game—no prior game-dev experience assumed.

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Ninja Agent

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coder

Memory Match Card Game Development Research Report

Executive Summary

This report provides comprehensive instructions and code for building a browser-based memory match card game, designed for developers with no prior game development experience. The implementation uses HTML, CSS, and JavaScript to create an interactive matching game where players flip cards to find pairs.

Research Methodology

Analysis was conducted on the provided conversation which included:

Initial code implementation review
Identification of code issues and improvements needed
Development of comprehensive step-by-step instructions

Technical Requirements

Prerequisites

Basic understanding of HTML, CSS, and JavaScript
Code editor (Visual Studio Code, Sublime Text, or similar)
Web browser

Project Structure

The game requires three main files:

index.html
style.css
script.js

Implementation Guide

1. HTML Implementation

1<!DOCTYPE html>
2<html lang="en">
3<head>
4    <meta charset="UTF-8">
5    <meta name="viewport" content="width=device-width, initial-scale=1.0">
6    <title>Memory Match Game</title>
7    <link rel="stylesheet" href="style.css">
8</head>
9<body>
10    <div class="game-container">
11        <div class="game-info">
12            <div class="moves">Moves: <span id="moves-count">0</span></div>
13            <button id="restart">Restart Game</button>
14        </div>
15        <div id="game-board"></div>
16    </div>
17    <script src="script.js"></script>
18</body>
19</html>

2. CSS Implementation

1.game-container {
2    max-width: 800px;
3    margin: 0 auto;
4    padding: 20px;
5}
6
7#game-board {
8    display: grid;
9    grid-template-columns: repeat(4, 1fr);
10    gap: 10px;
11    margin-top: 20px;
12}
13
14.card {
15    aspect-ratio: 1;
16    position: relative;
17    transform-style: preserve-3d;
18    transition: transform 0.5s;
19    cursor: pointer;
20}
21
22.card.flipped {
23    transform: rotateY(180deg);
24}
25
26.card-front, .card-back {
27    position: absolute;
28    width: 100%;
29    height: 100%;
30    backface-visibility: hidden;
31    border-radius: 8px;
32    display: flex;
33    align-items: center;
34    justify-content: center;
35}
36
37.card-front {
38    background-color: #2196F3;
39    transform: rotateY(180deg);
40}
41
42.card-back {
43    background-color: #E0E0E0;
44}
45
46.card.matched {
47    transform: rotateY(180deg);
48    pointer-events: none;
49}

3. JavaScript Implementation

1document.addEventListener('DOMContentLoaded', () => {
2    const gameBoard = document.getElementById('game-board');
3    const movesDisplay = document.getElementById('moves-count');
4    const restartButton = document.getElementById('restart');
5    
6    const symbols = ['🐶', '🐱', '🐭', '🐹', '🐰', '🦊', '🐻', '🐼'];
7    let cards = [...symbols, ...symbols];
8    let flippedCards = [];
9    let matchedPairs = 0;
10    let moves = 0;
11    let isProcessing = false;
12
13    function shuffle(array) {
14        for (let i = array.length - 1; i > 0; i--) {
15            const j = Math.floor(Math.random() * (i + 1));
16            [array[i], array[j]] = [array[j], array[i]];
17        }
18        return array;
19    }
20
21    function createCard(symbol) {
22        const card = document.createElement('div');
23        card.className = 'card';
24        card.innerHTML = `
25            <div class="card-front">${symbol}</div>
26            <div class="card-back"></div>
27        `;
28        card.dataset.symbol = symbol;
29        card.addEventListener('click', flipCard);
30        return card;
31    }
32
33    function flipCard() {
34        if (isProcessing || 
35            this.classList.contains('flipped') || 
36            flippedCards.length === 2) return;
37
38        this.classList.add('flipped');
39        flippedCards.push(this);
40
41        if (flippedCards.length === 2) {
42            isProcessing = true;
43            moves++;
44            movesDisplay.textContent = moves;
45            checkForMatch();
46        }
47    }
48
49    function checkForMatch() {
50        const [card1, card2] = flippedCards;
51        const match = card1.dataset.symbol === card2.dataset.symbol;
52
53        if (match) {
54            card1.classList.add('matched');
55            card2.classList.add('matched');
56            matchedPairs++;
57            if (matchedPairs === symbols.length) {
58                setTimeout(() => alert(`Congratulations! You won in ${moves} moves!`), 500);
59            }
60        } else {
61            setTimeout(() => {
62                card1.classList.remove('flipped');
63                card2.classList.remove('flipped');
64            }, 1000);
65        }
66
67        flippedCards = [];
68        setTimeout(() => {
69            isProcessing = false;
70        }, 1000);
71    }
72
73    function initGame() {
74        gameBoard.innerHTML = '';
75        matchedPairs = 0;
76        moves = 0;
77        movesDisplay.textContent = moves;
78        
79        shuffle(cards).forEach(symbol => {
80            gameBoard.appendChild(createCard(symbol));
81        });
82    }
83
84    restartButton.addEventListener('click', initGame);
85    initGame();
86});

Key Features

Responsive grid layout
Card flip animations
Match checking logic
Move counter
Restart functionality
Win condition detection

Possible Enhancements

Timer implementation
Difficulty levels
Theme selection
Sound effects
Score tracking system

Troubleshooting Guide

Card Flip Issues: Verify CSS transform properties
Matching Problems: Check symbol comparison logic
Layout Issues: Adjust grid settings

Conclusion

This implementation provides a solid foundation for a memory match game while maintaining code readability and extensibility. The modular structure allows for easy additions and modifications to enhance gameplay features.

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