The Dirt Screw is a large, steel, worm shaped robot that serves as a mini-boss in some adventures.
At the beginning of a fight with a Dirt Screw, the first thing you notice is the loud chainsaw like sound that is produced as it digs up, through the ground below you using drilling mechanisms attached to its head. It will then try to confuse you, burying itself and re-emerging up to 4 times from the left and right sides of the player. The Dirt Screw will then proceed to jump out underneath the player, and attack by surprise.
It is advised in a fight with a Dirt Screw to keep moving, as it fires multiple homing missiles that can quickly overwhelm the player.
P.S The Dirt Screw can prove somewhat annoying!!