 
HTML 5:

<!DOCTYPE html>
<html>
<head>
	<title>Slot Machine Game</title>
	<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
	<div class="slot-machine-container">
		<div class="slot-machine-wheels-container">
			<div class="slot-machine-wheel">
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/cherry.png" alt="cherry">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/lemon.png" alt="lemon">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/plum.png" alt="plum">
					</div>
				</div>
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/watermelon.png" alt="watermelon">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/orange.png" alt="orange">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/grapes.png" alt="grapes">
					</div>
				</div>
			</div>
			<div class="slot-machine-wheel">
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/bell.png" alt="bell">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/bar.png" alt="bar">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/seven.png" alt="seven">
					</div>
				</div>
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/doublebar.png" alt="doublebar">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/triplebar.png" alt="triplebar">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/blank.png" alt="blank">
					</div>
				</div>
			</div>
			<div class="slot-machine-wheel">
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/cherry.png" alt="cherry">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/lemon.png" alt="lemon">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/plum.png" alt="plum">
					</div>
				</div>
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/watermelon.png" alt="watermelon">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/orange.png" alt="orange">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/grapes.png" alt="grapes">
					</div>
				</div>
			</div>
			<div class="slot-machine-wheel">
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/bell.png" alt="bell">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/bar.png" alt="bar">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/seven.png" alt="seven">
					</div>
				</div>
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/doublebar.png" alt="doublebar">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/triplebar.png" alt="triplebar">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/blank.png" alt="blank">
					</div>
				</div>
			</div>
			<div class="slot-machine-wheel">
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/cherry.png" alt="cherry">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/lemon.png" alt="lemon">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/plum.png" alt="plum">
					</div>
				</div>
				<div class="slot-machine-wheel-row">
					<div class="slot-machine-symbol">
						<img src="images/watermelon.png" alt="watermelon">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/orange.png" alt="orange">
					</div>
					<div class="slot-machine-symbol">
						<img src="images/grapes.png" alt="grapes">
					</div>
				</div>
			</div>
		</div>
		<div class="slot-machine-buttons-container">
			<button type="button" class="slot-machine-button" id="spin-button">Spin</button>
			<button type="button" class="slot-machine-button" id="reset-button">Reset</button>
		</div>
	</div>
	<script src="script.js"></script>
</body>
</html>

CSS:

/*  Slot Machine Game */

.slot-machine-container {
	width: 600px;
	height: 400px;
	margin: auto;
	background-color: #ddd;
	border-radius: 10px;
	position: relative;
}

.slot-machine-wheels-container {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	overflow: hidden;
}

.slot-machine-wheel {
	width: 33.33%;
	height: 100%;
	float: left;
	position: relative;
	overflow: hidden;
}

.slot-machine-wheel-row {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	display: flex;
	flex-wrap: nowrap;
	transition: transform 1.5s;
}

.slot-machine-symbol {
	width: 33.33%;
	height: 100%;
	background-color: #fff;
	border: 1px solid #ddd;
	border-radius: 10px;
	margin: 1px;
}

.slot-machine-buttons-container {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	text-align: center;
	padding: 10px 0;
	background-color: #ddd;
}

.slot-machine-button {
	width: 100px;
	height: 30px;
	background-color: #ccc;
	border: 0;
	border-radius: 5px;
	cursor: pointer;
	margin: 0 5px;
}

.slot-machine-button:hover {
	background-color: #999;
}

JavaScript:

// Slot Machine Game

// Get slot machine elements
const slotMachineContainer = document.querySelector('.slot-machine-container');
const slotMachineWheelsContainer = document.querySelector('.slot-machine-wheels-container');
const slotMachineWheels = document.querySelectorAll('.slot-machine-wheel');
const slotMachineSymbols = document.querySelectorAll('.slot-machine-symbol');
const spinButton = document.querySelector('#spin-button');
const resetButton = document.querySelector('#reset-button');

// Set up initial variables
let spinning = false;
let wheelPositions = [0, 0, 0, 0, 0];
let wheelSpeeds = [0, 0, 0, 0, 0];
let currentPositions = [0, 0, 0, 0, 0];

// Set up event listeners
spinButton.addEventListener('click', spin);
resetButton.addEventListener('click', reset);

// Spin function
function spin() {
	// Check if slot machine is already spinning
	if (spinning) return;

	// Set spinning flag to true
	spinning = true;

	// Set wheel speeds
	wheelSpeeds = wheelSpeeds.map(() => {
		return Math.random() * 10 + 10;
	});

	// Start animation loop
	requestAnimationFrame(animationLoop);
}

// Reset function
function reset() {
	// Check if slot machine is spinning
	if (spinning) return;

	// Reset wheel positions
	wheelPositions = wheelPositions.map(() => 0);
	currentPositions = currentPositions.map(() => 0);

	// Update wheel positions
	updateWheelPositions();
}

// Animation loop
function animationLoop() {
	// Update wheel positions
	updateWheelPositions();

	// Check if wheels have stopped spinning
	let finished = wheelSpeeds.every(speed => speed < 0.1);
	if (finished) {
		spinning = false;
		return;
	}

	// Animate
	requestAnimationFrame(animationLoop);
}

// Update wheel positions
function updateWheelPositions() {
	// Update current positions
	currentPositions = currentPositions.map((position, index) => {
		let newPosition = position + wheelSpeeds[index];
		if (newPosition >= slotMachineSymbols.length) {
			wheelPositions[index]++;
			return newPosition - slotMachineSymbols.length;
		}
		return newPosition;
	});

	// Update wheel speeds
	wheelSpeeds = wheelSpeeds.map(speed => speed * 0.95);

	// Update wheel positions
	slotMachineWheels.forEach((wheel, wheelIndex) => {
		let position = wheelPositions[wheelIndex];
		wheel.style.transform = `translateY(-${position *
			slotMachineSymbols[0].offsetHeight}px)`;
		slotMachineSymbols.forEach((symbol, symbolIndex) => {
			let currentPosition = currentPositions[wheelIndex];
			if (symbolIndex === currentPosition) {
				symbol.style.opacity = 1;
			} else {
				symbol.style.opacity = 0;
			}
		});
	});
}

Flash:

// Slot Machine Game

// Create the slot machine
var slotMachine:SlotMachine = new SlotMachine();
slotMachine.x = stage.stageWidth / 2;
slotMachine.y = stage.stageHeight / 2;
addChild(slotMachine);

// Create the spin button
var spinButton:Sprite = new Sprite();
spinButton.graphics.beginFill(0xcccccc, 1);
spinButton.graphics.drawRoundRect(0, 0, 100, 30, 5);
spinButton.graphics.endFill();
spinButton.x = slotMachine.x - spinButton.width / 2;
spinButton.y = slotMachine.y + slotMachine.height / 2 + spinButton.height;
addChild(spinButton);

// Create the reset button
var resetButton:Sprite = new Sprite();
resetButton.graphics.beginFill(0xcccccc, 1);
resetButton.graphics.drawRoundRect(0, 0, 100, 30, 5);
resetButton.graphics.endFill();
resetButton.x = slotMachine.x + slotMachine.width / 2 - resetButton.width / 2;
resetButton.y = slotMachine.y + slotMachine.height / 2 + resetButton.height;
addChild(resetButton);

// Set up initial variables
var spinning:Boolean = false;
var wheelPositions:Array = [0, 0, 0, 0, 0];
var wheelSpeeds:Array = [0, 0, 0, 0, 0];
var currentPositions:Array = [0, 0, 0, 0, 0];

// Add event listeners
spinButton.addEventListener(MouseEvent.CLICK, spin);
resetButton.addEventListener(MouseEvent.CLICK, reset);

// Spin function
function spin(e:MouseEvent):void {
	// Check if slot machine is already spinning
	if (spinning) return;

	// Set spinning flag to true
	spinning = true;

	// Set wheel speeds
	wheelSpeeds = wheelSpeeds.map(function():Number {
		return Math.random() * 10 + 10;
	});

	// Start animation loop
	addEventListener(Event.ENTER_FRAME, animationLoop);
}

// Reset function
function reset(e:MouseEvent):void {
	// Check if slot machine is spinning
	if (spinning) return;

	// Reset wheel positions
	wheelPositions = wheelPositions.map(function():Number {
		return 0;
	});
	currentPositions = currentPositions.map(function():Number {
		return 0;
	});

	// Update wheel positions
	updateWheelPositions();
}

// Animation loop
function animationLoop(e:Event):void {
	// Update wheel positions
	updateWheelPositions();

	// Check if wheels have stopped spinning
	var finished:Boolean = wheelSpeeds.every(function(speed:Number):Boolean {
		return speed < 0.1;
	});
	if (finished) {
		spinning = false;
		removeEventListener(Event.ENTER_FRAME, animationLoop);
		return;
	}
}

// Update wheel positions
function updateWheelPositions():void {
	// Update current positions
	currentPositions = currentPositions.map(function(position:Number, index:int):Number {

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