Here is an example of a 3D maze game implemented as a single HTML file using JavaScript and enclosed in script tags:
In this game, you navigate a 3D maze represented by a 2D array. The maze is displayed as a grid of cells, where 1 represents walls and 0 represents empty spaces. You control a player character represented by a blue cell. The goal is to reach the end of the maze, represented by a red cell.
You can control the player character using the arrow keys on your keyboard. The player can move up, down, left, or right, but cannot pass through walls (cells with a value of 1) or move outside the boundaries of the maze. If the player reaches the end of the maze (cell with a value of 2), a congratulatory alert message is displayed.
Please note that this is a basic example and can be expanded upon to include additional features, such as scoring, multiple levels, and more complex maze structures.