Sure, here's an example of a game implemented as a single HTML file using JavaScript. This game is called "Vacation City Adventure" and assumes smartphone operation. It features a world map where the USA is located in Asia.
In this game, you'll see a world map with three destinations: USA in Asia, Asia, and Europe. The player, represented by a red dot, can be moved by touching or clicking on the canvas. When the player reaches a destination, an alert message will appear indicating the reached destination. You can add more destinations to the `destinations` array if desired.