Massive Megahydron is an incredibly big robot. It’s entirely powered by redstone and is hooked up with more than 10 different types of rocket launchers which fire everything from explosive charges to poisonous arrows. This is a great map to try if you are looking to learn more about robotics in Minecraft and maybe even learn to build ones yourself.
To start the robot use a flint and steel on the observer blocks as seen in the image down below.
As soon it has been ignited it will start moving forward and shoot explosives.