Sure, here's an example of a simple game that you can play, featuring Marvel vs DC characters. It's implemented as a single HTML file, contains JavaScript within script tags, and can be played on a smartphone. It uses pictograms to represent the characters.
In this game, you can select a character from either Marvel or DC by tapping on their respective pictogram. Once selected, a message will appear displaying your selection. Of course, this is just a starting point, and you can further extend the game logic and interactivity based on your requirements.