Sure! Here's a basic implementation of a Beyblade battle game using JavaScript within a single HTML file:
In this simple game, Player A controls the red Beyblade using the arrow keys, while Player B controls the blue Beyblade using the W, A, S, and D keys. The beyblades can move around the canvas based on the respective controls. You can add further game logic, such as scoring, collisions, and effects, as per your requirements.