This is a basic implementation of a 3D movement test game using JavaScript enclosed in script tags within a single HTML file. The game can be played on a smartphone.
In this game, the player is represented by a green square on the canvas. The player can move up, down, left, and right using the arrow keys on the keyboard. The player's position is updated based on the key inputs, and the canvas is cleared and redrawn in each game loop to show the updated player position.
Please note that this is a simple demonstration and does not include actual 3D graphics or complex gameplay elements. It is a basic template to test and showcase movement functionality.