The Lock-On Missile (ロックオンミサイル発射,Rokkuonmisairu hassha?, lit. "Lock-on Missile fire"), also known as Homing Missile Launch (ガン発射,Gan hassha?, lit. "Gun fire") or Homing Missile, is an attack which first appeared in Sonic R. When performing it, the user shoots missiles at a marked target.
When using the Lock-On Missile, the users use their weapon equipment to firing a missile at a marked target. The missile will then automatically follow the target until it hits it. For those with more technological advanced equipment, the users can fire several missiles in rapid succession at multiple targets.
In gameplay, the Lock-On Missile is used by the player to attack previously marked enemies/opponents from afar with missiles. Regardless from which angle the Lock-On Missile is used, the missiles launched will always home onto the targets until they hit, either causing damage or destroying the target.
The Lock-On Missile first appeared in Sonic R, where it was named Homing Missile. In this game, it is one of the actions Dr. Robotnik and EggRobo can perform during a race. Here, Dr. Robotnik uses his Egg Mobile's weapon equipment to perform the Homing Missile, while EggRobo uses its standard hand weapon.
In gameplay, the Homing Missile is used to attack other characters during a race. To use the Homing Missile once, the player must pay 10 Rings, with a brief recharge period between each shot. When using the Homing Missile, the player first has to let a reticle appear on the screen and let it lock onto a nearby racer (which is signified by it turning green). To fire the missile, the player then has to press the Jump button (, , or Y button). If the opponent is hit, it will greatly slow him/her down. Also, if the target is wearing a protective shield (Lightning Shield or Water Shield), the Homing Missile will eliminate it.
In gameplay, the Homing Missile Launch is used to attack the targets marked by Gamma's Laser Gun. To use the Homing Missile Launch, the player has to press the /// Button after marking a target with Laser Gun, where Gamma will rapidly shoot enough energy missiles to hit all marked targets, which will then either destroy or damage them.
By obtaining the Level Up ItemLaser Blaster, the Homing Missile Launch gains a larger attack radius by creating a large explosion upon the missile's contact with the enemy, allowing it to damage enemies close to the targets. It also changed the color of Gamma's energy missiles from yellow to light blue.
Sonic Adventure 2
In Sonic Adventure 2 and its enhanced port, Sonic Adventure 2: Battle, the Lock-On Missile is used by Tails and Dr. Eggman. Here, Tails and Eggman use the Lock-On Missile as a part of the weapon arsenal onboard the Cyclone and the Eggwalker respectively. On Tails' Cyclone, the Lock-On Missile is fired from the cannon located on the rear, and on Eggman's Egg Walker, the Lock-On Missile is fired from the cannon on the left side of the cockpit.
Like in Sonic Adventure and Sonic Adventure DX: Director's Cut, the Lock-On Missle is used to attack the targets marked by the Tails/Eggman's Lock-on, with the Lock-On Missile's mechanics being the same as those games. To use the Lock-On Missile, the player has to press /// after marking a target with Lock-on.
Like Sonic Adventure and Sonic Adventure DX: Director's Cut, the player can obtain the Level Up ItemLaser Blaster for larger attack radius when the Lock-On Missile impacts the targets. When Tails obtain the Laser Blaster, his Lock-On Missile changes color from yellow to blue, and when Eggman obtains the Laser Blaster, his Lock-On Missile changes color from yellow to green.
In Sonic Adventure, Gamma's missiles are very fast and hit an enemy within a matter of seconds. In Sonic Adventure 2, Tails and Eggman's missiles have varying speeds depending on where they are.
In the normal Stages, Tails and Eggman's missiles move very fast towards the enemies, but in the Boss Fights against each other, the missiles move considerably slower, so that they can be avoided easier.
Also in the Stages, the missiles never miss, but in the Boss Fights and 2-Player mode, they are not as accurate and may miss the intended target.