The Egg Mobile-D is a predominantly red and gray armored dune buggy-like vehicle that runs on four wheels. It has the Egg Mobile located in the middle, and a large drill at the front.
Features and abilities
The Egg Mobile-D's main feature include the large spinning drill at the front end of the machine. It is also capable of functioning as a long-ranged but somewhat slow projectile weapon, as it can be launched from the front end towards its target.
The Drill Mobile is vulnerable to a simple Spin Attack. After being hit seven times, Robotnik will laugh and shoots the drill-bit straight off the Drill Mobile. One final hit is required to destroy the machine, after which the doctor detaches his Egg Mobile from the vehicle and flies away. The player can then open the Capsule and complete the Zone.
In Sonic the Hedgehog 2 from the Sonic Cafe mobile phone service, the Drill Eggman is slightly bulkier and has a little more armor, making the hitbox of vehicle smaller to attack.
In Sonic Advance, the Egg Mobile-D appears as the second boss of X-Zone (as well as the eighth boss overall in the game).
While the battle is mostly the same, there are slight differences now. In the beginning of the fight, Eggman is already seen in the Egg Mobile-D when it arrives to the battle arena, which is now completely flat. This version takes only four hits to be destroyed, while like in Sonic the Hedgehog 2, it shoots its drill part towards the player after the third hit. After destroying the Egg Mobile-D completely, Eggman flees, allowing the player to progress further in the X-Zone.
In Sonic Mania, and its expansion Sonic Mania Plus, a mini version of the Egg Mobile-D appears as one of the many prizes the Gachapandora can drop. In gameplay, it will go back and forth across the arena. Each one of these "prizes" require three hits to be destroyed.
A similar vehicle to the Egg Mobile-D was originally going to be Eggman's racing vehicle in Sonic & Sega All-Stars Racing, as it is shown to be somewhat smaller in early concept art. In the finished product however, Eggman's racing car became the Egg Monster.
In Sonic Jam compilation, Drill Eggman is one of three bosses that the player will encounter in the easy mode of Sonic the Hedgehog 2. While having an identical attack pattern, it only takes three hits to defeat it.