Sure! Here's a simple implementation of a game combining elements from Minecraft and Roblox using JavaScript in a single HTML file:
This implementation sets up a simple game area with `div` element of 400x400 pixels size. The game allows the player to move around the game area (represented by blocks) using directional controls (arrow keys or buttons on a smartphone). When the player clicks on a block, it replaces the block with the current player's block type.
The game starts with a grassy area and a randomly placed tree (representing Minecraft and Roblox elements). You can expand on this code to add more features, interactions, and visual elements to make it more like a full-fledged game combining Minecraft and Roblox.