Green Hill Zone boss (Sonic Blast)


 * For the Sonic the Hedgehog (1991) boss of the similarly named Green Hill Zone, check for Egg Mobile-H.

The Green Hill Zone boss is the first boss of the game Sonic Blast, wich the player fights at the end of Green Hill Zone Act 3. To defeat this unnamed boss, the player must hit the Egg Mobile's protective glass six times.

The Green Hill Zone boss is mostly a regular Egg Mobile but it moves around using helicopter rotor blades in addition of the usual Egg Mobile jet propulsion and have a giant white boomerang attached to it. It is more armored than a normal Egg Mobile with a protective roof and glass on top of the engine. It's mostly grey with the usual yellow and black stripes of the Egg Mobile.

Battle
When the player arrive to a wide empty area at the end of Act 3, Robotnik arrive at the top-right corner of the screen. After some seconds, he'll start making the boomerang spin at an increasing speed before launching it in a diagonal low curve pattern toward the lower-left part of the screen before the boomerang goes off-screen. The boomerang will then come back to Robotnik from the upper part of the battle area. He will then use again this attack before moving his engine to the left corner of the screen, being off-screen, before coming back this time at the top-left corner of the screen and starting the whole process again and again (albeit in the opposite direction each time) until the boss is defeated.

It will need six hits to be defeated, but those hits must precisely be dealt on the protective glass of the Egg Mobile. Trying to hit the boss from any other spot will simply bounce back the player without dealing any damage (and potentially put the player at risk of being caught in the boomerang pattern).

After being defeated, the Green Hill Boss will simply self-destruct before dissapearing in a flash of white, clearing the level.

Trivia

 * The rare use of rotor blades to make the Egg Mobile move around makes the boss similar to Sonic the Hedgehog 2's Eggman Egg Mobile-D.