Sure! Here's an example of a simple game implemented as a single HTML file, using JavaScript and enclosed in `` tags. The game features a random emoji moving within a box, and every time it hits a wall or corner, a new emoji appears and it gets 5% faster. You can play this game on a smartphone by opening the HTML file in a browser:
<br><br>
<br>
<style>
#box {
position: relative;
width: 300px;
height: 300px;
border: 1px solid black;
}
.emoji {
position: absolute;
font-size: 20px;
}
</style>
<div id="box"></div>
To use this, create a new HTML file, copy the code above into it, and save the file. Then, open the HTML file on your smartphone using any browser. You should see a box with a random emoji moving around. Every time the emoji hits a wall or corner, a new emoji will appear, and it will gradually increase its speed by 5%. Have fun playing the game!