Sure! Here's an example of a simple game implementing a 3D ripoff of Minecraft with mobs and blocks using JavaScript and HTML:
In this game, you navigate a player character (represented as "P") using the arrow keys on a smartphone. The player moves around a grid. There are blocks (gray rectangles) and mobs (red rectangles). The objective is to avoid colliding with blocks and mobs. If a collision occurs, a game over message is shown, and the game resets.
Please note that this is a basic example with minimal functionality, and it does not include advanced 3D graphics or complex mechanics like the original Minecraft. However, it should give you a starting point to build upon if you desire to extend and enhance the game further.