Majestic Twelve: The Space Invaders Part IV/World 4A

Area 1 (US: Round 33)
This area contains twenty-two Large Invaders, twelve Medium Invaders and fourteen Small Invaders in two separate horizontally-moving formations; the song you will hear from that Yamaha YM-2610 is also another new composition.

Area 2 (US: Round 34)
This area (again) contains twenty-two Large Invaders, twenty-two Medium Invaders, and eleven Small Invaders in a horizontally-moving formation; however, some of the invaders shall break away from it and fly around directly above the two CG30s, while firing bullets down at them from there and screeching metallically from the Yamaha YM-2610.

Area 3 (US: Round 35)
This area contains eleven Large Invaders, eleven Medium Invaders, and six Small Invaders, in a horizontally-moving formation; when one of them is hit for the first time, it shall split into two (which adds up to a total of fifty-six invaders). Once you have cleared this one, a remix of that first "boss" theme shall start to be heard from the Yamaha YM-2610.

Area 4 (US: Round 36)
As the Boss Invader comes down into view from the top of the screen, it will start firing lasers down at the two CG30s from its four tentacles; its eye is its only vulnerable point, and once you have hit it ten times, it will change colour from blue to yellow (and again from yellow to red once you have hit it twenty times). Once you have hit it thirty times, it will explode and fall off the bottom of the screen, and the player who registered that killer shot will receive 70000 points - and you will then proceed to the third "Cattle Mutilation" (however, if you are playing the US version, you will proceed to World 4B, or "Round 37"), and the song you will hear from the Yamaha YM-2610 in it is identical to that of this one.