In Mega Man ZX, Area D and Area O consist of a highway.
Area D (Highway) is the area which was under siege by massive Maverick attacks and leads to Slither Inc.'s office. The player fights against Girouette in this area and acquires Biometal Model Z, allowing the player to Double Megamerge and become Model ZX. Most of the layout resembles the opening stage of the first Mega Man X game, a long highway with two battles against a flying sub-boss (King Flyer) resembling the Bee Blader. The soundtrack for this area is called Cinq Ville ~ C'est Notre Espoir.
Area D-4 and D-5 serve as the stage for the final mission (Slither. Inc.'s main office) which culminates in the final battle between Vent/Aile and Serpent. All of the main mission bosses are fought at some point in this area before progressing to the final boss. Clearing this area's mission (which in effect, clears the game) unlocks Hard Mode; and if completed with both Vent and Aile, unlocks the ability to retain Model X in subsequent playthroughs. The soundtrack for this area is called Snake Eyes.
Area O (Highway 2) is a highway attacked by Slither Inc. after Serpent retrieved the Model W core in Area M. Prometheus and Pandora are leading the Maverick attack, and they are fought together at the end of the area's mission, "Repel the Army". Deluxe Galleon Wing reappear there from Area X. Area O is accessed from Area D-3. The soundtrack for this area is called Black Burn.
A Highway is attacked by Mavericks led by Thetis to obtain a Model W piece underwater. It bears some resemblance to the Highway from the previous game, but it is unknown if they are the same. After defeating Thetis, the player can return to the area and race against a Galleon Rider.
|Mega Man ZX series|
| Vent • Aile • Ashe • Grey • Girouette • Prairie • Guardians • Hunters • Raiders|
Sage Trinity • Aeolus • Atlas • Thetis • Siarnaq • Serpent • Prometheus • Pandora • Pseudoroids
|Mega Man ZX • Mega Man ZX Advent|
|ZX (Vent's story) • ZX (Aile's story) • ZXA (Grey's story) • ZXA (Ashe's story)|
| Biometal • Game of Destiny • Humanoid • Locations • Mega Man |
Mega Man ZX (manga) • ZX Tunes • ZXA Tunes • Rockman ZX Soundsketch - ZX GIGAMIX
|Mega Man ZX Advent|
| Buckfire the Gaxelleroid • Chronoforce the Xiphosuroid • Rospark the Floroid • Queenbee the Hymenopteroid|
Vulturon the Condoroid • Hedgeshock the Erinaceroid • Argoyle and Ugoyle the Shisaroids • Bifrost the Crocoroid
|Dogu the Giant • Siarnaq • Atlas • Aeolus • Thetis |
Vent • Aile • Prometheus • Pandora • Master Albert
|Database • Items • Game Script (Grey's story • Ashe's story)|