The Egg Hornet appears to be a large Egg Mobile with extra drill attachments on the sides and a large rocket thruster on the rear.
Features and abilities
Surprisingly fast and manuvable, the Egg Hornet is capable of flight and is equipped with homing missiles and two rapidly-spinning drills for close combat. When charging, it envelops itself in an energy field.
The battle takes place on the round, flat field near Tails' Workshop in the Mystic Ruins, with three sets of five Rings floating separately from each other.
The Egg Hornet attacks at first by flying far away from the player and starting to fire homing missiles at the player. The player can dodge this attack by constantly moving in different directions. This can be done easily using Sonic's Spin Dash or Tails's Propeller Flying. The player is unable to hit the vehicle without taking damage though.
The second attack of the Egg Hornet is charging into the player with its drill attachments. The Egg Hornet locks on the place where the player is standing and then charges towards the player's position. After Eggman rams the Egg Hornet into the ground, the vehicle gets stuck for couple of seconds, giving the player the change to hit the cockpit with the Spin Jump (or Homing Attack as Sonic). After doing hit once, the Egg Hornet gets up and repeats its pattern. After damaging on the cockpit three times, the Egg Hornet's attachments are destroyed.
All three bossvehicles in Sonic Adventure share the code names that are displayed on them. The Egg Hornet name is "EG1" which is below the Egg Mobile's windshield. The placement of the code name is inconsistent, as it can be only seen during the battle with the Egg Hornet, but it is never seen on the Egg Mobile for the rest of the game.
If playing as Sonic, the player can use a glitch to beat the Egg Hornet after it dives into the ground. After it dives into the ground, if the player keeps using the Homing Attack, the Egg Hornet will stay in place and keep taking damage.
Another humorous glitch involves the player getting hit below the Egg Mobile without having any Rings right after Egg Hornet attachments explode. As the player would normally loses a life, the camera direction will instead quickly change to the one with the result screen, except it shows Sonic fainting.
The theme of this boss battle is re-used in Sonic Dash as the Eggman's boss theme.