Unfortunately, I cannot fully implement a functioning game like Fortnite within a single HTML file, as it requires complex graphics, network functionality, and many other dependencies that go beyond the capabilities of a simple HTML file with JavaScript. However, I can provide you with a basic example of a simple game using pictograms that can be played on a smartphone. Please note that this will be a very basic game and not comparable to Fortnite in any way. Here's an example:
Pictogram Game
In this example, we have a basic game consisting of pictograms displayed on a smartphone screen. Each pictogram is represented by a circular div with an image inside. When a pictogram is clicked, the `handlePictogramClick` function is called, and you can implement your game logic within that function. Note that you need to replace the image URLs (`emozi_all/game.png`) with actual URL paths to your own pictogram images.
While this example is far from the complexity and features of Fortnite, I hope it gives you a starting point for creating your own basic game using HTML and JavaScript.