Majestic Twelve: The Space Invaders Part IV/World 2A

Area 1 (US: Round 8)
This area contains eleven Large Invaders, eleven Medium Invaders, and six Small Invaders in one horizontally-moving formation; when one is shot for the first time it will split into two which adds to a total of fifty-six invaders. The song you shall be hearing from that Yamaha YM-2610 is another brand-new composition, and it will speed up with the invaders.

Area 2 (US: Round 9)
This area contains fourteen Type 3 Circling Invaders and eighteen Type 4 Circling Invaders (in, as their name implies, a circling formation); the formation was first employed by the Flector in the first stage of Return of the Invaders (1985).

Area 3 (US: Round 10)
This area (again) contains twenty-two Large Invaders, twenty-two Medium Invaders, and eleven Small Invaders in a horizontally-moving formation; once you clear it, the "boss" theme will begin to be heard from the Yamaha YM-2610.

Area 4 (US: Round 11)
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 50000 points - the game will then go back to the zone selection screen, and you will have ten seconds to choose between World 3A and World 3B (however, if you are playing the US version, you will automatically proceed to World 2B or "Round 12").