The Neo South Island Zone boss is a modified Egg Mobile. It has gray tracked wheels attached to it for transportation instead of jet propulsion. Like an Egg Mobile, it also has a small windshield on the front, gray edges, and two brown mufflers on the back of it. A large sledgehammer is attached to the front via a gray mechanical arm. In terms of coloration, it is mostly red with a black underside and a gray front. Its sledgehammer is yellow and red. It also has the Egg Mobile's usual yellow and black hazard stripes on the sides.
Powers and abilities
Robotnik's vehicle can roll along the ground using its tracked wheels. Its main weapon is a giant sledgehammer that can hit the ground so hard that it causes large shockwaves, causing damage to the area around it.
Sonic the Hedgehog Pocket Adventure
In Sonic the Hedgehog Pocket Adventure, Dr. Robotnik used this vehicle to attack Sonic as he passed through Neo South Island Zone. In spite of Robotnik's efforts though, the vehicle was destroyed by Sonic in the end.
After the player passes the final Start post, they arrive in a wide empty area at the end of Neo South Island Zone Act 2. Dr. Robotnik will then appear in his vehicle, which will fall down into the arena, initiating the boss battle. First, Robotnik will roll toward the left side of the arena, slamming the ground with his sledgehammer as he goes, before driving off-screen. He will then emerge from the left side of the screen and move across the arena again, this time exiting on the right side of the arena. He will the remerge from the right and start the whole process over again. After taking four hits however, Robotnik will change his attack pattern, now pausing once he reaches the center of the arena to slam the ground with the hammer. The shockwave that ensues will inflict damage regardless of where Sonic stands, so be sure to jump when seeing him raise the sledgehammer.
This boss needs to be hit eight times to be defeated. However, the player must be careful not to get hit by the sledgehammer when launching an attack on Robotnik, as there is a small cooldown between Robotnik taking damage and being able to attack. Noticeably, Robotnik also occasionally stops to laugh at Sonic.