The Hot Mobile is a sphere-shaped capsule with a black bottom, thick gray armor on the upper half, a transparent window on the front, a spiked rim encircling the top of the vehicle, and extra long spikes protruding diagonally from the sides of a low-set cannon on top of the Hot Mobile.
Powers and traits
The Hot Mobile is resistant to incredibly high temperatures, being able to submerge itself in magma without taking any kind of damage. It is also capable of flight, is equipped with missiles, and can fire iron balls from its top cannon.
Sonic the Hedgehog 3 & Knuckles
In Sonic & Knuckles and Sonic the Hedgehog 3 & Knuckles, the Hot Mobile was used by Dr. Robotnik to ambush Sonic and Tails while the duo were making their way through the Lava Reef Zone by firing the Hot Mobile's missiles at them. However, the two heroes were able to dodge the Hot Mobile's missiles, though they were eventually forced down to a pool of magma at the foot of a magma fall. Finding Sonic and Tails with only slivers of solid rock to stand on above the magma pool, Robotnik engaged them with the Hot Mobile. However, by turning the Hot Mobile's iron ball projectiles against the Hot Mobile, Sonic and Tails were able to damage the Hot Mobile enough to make it sink into the magma, which soon hardened. Robotnik survived this setback though.
The Hot Mobile is the second boss of Lava Reef Zone. It is the overall eight boss of Sonic & Knuckles. It is fought at the end of Lava Reef Zone Act 2.
The objective of the entire level is simply to dodge obstacles and not touch Robotnik. If the player does not have a Flame Shield, they must land on platforms and not touch the lava. Dr. Robotnik will shoot iron balls, so the player must be aware in order to dodge them. Dr. Robotnik will tilt the lava in a diagonal arc and attempt to drag the player into touching the boss. Unfortunately for Dr. Robotnik, due to the angle of the lava, the iron balls will also land on him and damage his own vehicle.
Because this boss cannot be damaged by the player, this can be considered the longest fight in the game when attempting a speed run.
The Hot Mobile is the only main boss in the game that cannot be hurt by Sonic or Tails by any means; not even Super Sonic, Hyper Sonic, or Super Tails can damage it.
Unlike most bosses which take eight hits, the Hot Mobile takes fourteen, meaning Robotnik will alternate his attack at least four times before his vehicle is destroyed.
The Hot Mobile as it appears during the first phase.