Sure! Here is an example of a simple WW2 Morse code game implemented as a single HTML file using JavaScript:
WW2 Morse Code Game
Score: 0
Decode the following Morse code:
To play the game, you will be presented with a Morse code representation of a word. You need to enter the decoded word using the keyboard. If your input matches the correct word, your score will increase by 1, otherwise, it will decrease by 1. The game will then present a new Morse code word for you to decode.
Note that this is a very basic implementation and can be expanded upon to add more features and levels.