Sure, here is a simple iOS system implemented as a game in a single HTML file:
iOS Game
Tap on the pictograms to interact with the system.
In this game, you can tap on the pictograms (represented as images) to interact with the simulated iOS system. Tapping on the home button, app store button, or settings button will trigger an alert message indicating the action you are performing. Feel free to customize the game further by adding more functionality or styling!