Sure! Here's an example of a simple Japanese learning game implemented as a single HTML file using JavaScript and enclosed in script tags:
In this game, pictograms representing simple Japanese phrases or greetings are displayed, and the player needs to input the corresponding English translations. Each correct answer increases the score, while incorrect answers are penalized. After five questions, the game ends, and the player's final score is displayed.
Note that this is just a basic example, and you can customize and expand it as per your requirements to make it more engaging and interactive.