From Wikipedia
Double Dragon II: The Revenge (ダブルドラゴンⅡ The Revenge) is a side-scrolling beat 'em up produced by Technos originally released as a coin-operated arcade game in 1988. It is the sequel to Double Dragon, released during the previous year. A home version for the Nintendo Entertainment System was released in 1989 which differs drastically from the original arcade game. Other home versions were also released for the Genesis/Mega Drive and PC Engine.
Arcade version
The arcade version of Double Dragon II: The Revenge begins with Marian, the heroine from the original Double Dragon, being shot to death by the leader of the Black Warriors. Once again, the player assume the role of brothers Billy and Jimmy Lee, who are now tasked with the duty of avenging Marian's death. The arcade version of the game is essentially an improved version of the original title. The biggest change in the game's controls are in the replacement of the original's punch and kick buttons with two directional-based attack buttons (Left Attack and Right Attack) similar to Renegade. Pressing the attack button of the player's current direction will do a standard series of punches, while pressing the opposite attack button will perform a back kick. A few new moves are added as well, including a Hurricane Kick.
Almost all of the returning enemy characters from the first game were given makeovers and new moves which they can use against the player. The weapons that can be use by the player has also been redrawn and modify from the previous game. The steel bats and dynamite sticks for example, were replaced by shovels and grenades.
Like in the original game, the arcade version of Double Dragon II is divided into four missions: a heliport, a lumber storehouse, a wheat field, and the new hideout of the boss. Each stage has its own boss character with his own leitmotif theme. After defeating Willy (the final boss from the original game) in the fourth stage, the player will confront a double of their own character for the game's final battle. If two players reach the end together, then both will get to face their own clone for the final battle.
Scenario 1: The game begins with the death of Marian, killed by Willy, the older leader of the Black Warriors from the previous game. The first scenario takes place at the airport where the crime occurred (starting in a similar place as the first part). The boss is Burnov, who disappears after dying, leaving only his clothes on the ground.
Scenario 2: It is a lumber yard similar to the factory in the first game. The boss is Abore, a giant with a resemblance to Arnold Schwarzenegger.
Scenario 3: It is a field similar to the forest from the first game. Halfway through the phase, a combine harvester will try to crush the player. The phase ends at the entrance to the final fortress. The boss is Chin Taimei, a very powerful fighter, he attacks with an aerial kick or is capable of sweeping you, and also fights with two kali sticks.
Final Scenario: the enemy's fortress. More enemies like the previous one, with barrels coming towards the player and blocks coming out of the wall. The head of the party is Willy, Marian's murderer. After defeating the bad guy with the machine gun, a clone of the player appears, which will sometimes get inside the character.
The arcade version ends with a photograph of the Lee brothers with Marian. Marian cries a tear that then forms the words "The End" at the bottom of the screen.
Home versions
Nintendo Entertainment System
The NES version retained the 2-Player co-op feature that was missing in the first NES game.The Nintendo Entertainment System version of Double Dragon II: The Revenge was produced by Technos Japan and released in Japan on December 23, 1989. An English localization was published by Acclaim Entertainment, which was released on January 1990 in North America and later in the PAL region.
Much like the first game, the NES version of Double Dragon II features many drastic differences from the original arcade game. Unlike the first NES game, the game can now be played cooperatively with a second player. There are two different 2-Players Mode, A and B: the latter differs from the former, in that both players can hurt each other with their attacks. There are also three difficulty settings, which also determine the length of the game in the English version. The final mission is only available on the hardest difficulty setting.
While the premise is the same as the arcade version, the game now features story sequences before each stage which serves to advance the plot. The level designs are also completely different, with the NES version featuring nine missions instead of just four. Most of the enemy characters from the arcade version are featured in the NES version as well, while a few were replaced by new ones. Notably, the ninth and final mission is a battle against the "Mysterious Warrior", a character introduced in the NES version who serves as the new final boss. In contrast to the arcade's bittersweet ending, the NES version features a happier ending in which Marian is brought back to life after the final opponent is defeated.
Released in December 1989 in Japan by Technos and in January 1990 by Acclaim in the United States, this version features additional stages and mechanics, as well as some enemies and platforming that are not present in the arcade version, as well as scenes that tell the game progression in episodes.
Scenario 1 or Mission 1: Into the Turf (In the territory). It takes place in the city. The stage shows large boxes, blinds, hydraulic doors, abandoned warehouses, stairs. At the higher level, to which you ascend, you can fall and lose a life due to falling. The boss, Burnov, vanishes once and then reappears; when he disappears a second time, he is defeated.
Scenario 2 or Mission 2: At the heliport. In the city, at night. The legend that tells the story says that the enemies are escaping. The bosses are ninjas who throw shurikens. The stage shows cliffs, stairs, doors, and finally the helicopter. The one the Double Dragons hang on to when he tries to escape.
Scenario 3 or Mission 3: Battle in the chopper. While the enemies escape, fighting takes place inside the helicopter. The door opens and closes successively, becoming another opponent and helper. It's a small space. The boss is Bolo.
Scenario 4 or Mission 4: Undersea base. The helicopter lands on a "mysterious" island. There is water, pipes, and doors. Also an elevator that descends below the water, where there is a passage with a low ceiling with spikes and pipes coming out of the ceiling that hurt. It has the same boss as 3, Bolo. The stage closes with a screen with parallel floors that run in opposite directions (track traps).
Scenario 5 or Mission 5: Forest of death. It is the place where the island-base has taken them. In a forest. There are trees, grass, broken fences, danger signs. Stones, stairs. A river with a waterfall. Hydraulic doors. In the end, you have to get on an indefinable machine, a kind of locomotive, that comes and goes, with tracks and pipes of boiling steam from which Abore, the boss, descends.
Scenario 6 or Mission 6: Mansion of terror. The DDs don't know where they are. They smell, they say, evil in the air. From the signs, they seem to have been taken to a temple in Japan. There are lit torches that drop fire. There is an image of the Buddha in the center. Walls with rosette patterns and the music tries to be scary. The stage has no boss. The exit consists of trap-platforms that disappear and appear and which you have to use as a ladder.
Scenario 7 or Mission 7: Trap room. The legend that tells the story gives a warning of danger. Billy feels that he hears Mariam's voice. The setting is a kind of industrial plant full of traps. There are tracks, cliffs with spikes in the ground, pipes, doorways, gears, floors with spikes underneath that fall or shrink, and more hydraulic doors. It has the same boss as 5, Abore.
Scenario 8 or Mission 8: The Double Illusion. It is a palace with a polished or perhaps ice floor. With columns and symmetries, with spiked cliffs. Some stairs. Several bosses from the previous scenes appear. Everything leads to a smaller room where there is a blue carpet with a Japanese ideogram with the drawing of two dragons, where multiple ninjas appear and finally the "Double Dragon shadows", which are gray (the screen darkens and is more diffuse, the music Although it is not scary, it creates an enigmatic environment). The real bosses of the stage are these last ones, the shadows of the Lee brothers, who have the additional power to throw a ball of Chi and disappear and get into the bodies of the brothers in order to hit them from within.
Scenario 9 or Mission 9: Final Confrontation. He has no secondary enemies, only a mysterious nameless warrior. On a silent screen, Marian is rigid, there are torches and bricks and columns and other ornaments. As you approach Marian, the screen darkens and the final boss of the game appears above it, a tall man with long green hair and a red cape.
Mega Drive
The Mega Drive version of Double Dragon II: The Revenge was released by Palsoft exclusively in Japan on December 20, 1991. Unlike the NES version, the Mega Drive version of Double Dragon II is more of a direct conversion of the original arcade game, featuring the same levels and moves, as well as almost every enemy characters. The level design for Mission 2 was slightly changed in the Mega Drive.
PC Engine
A PC Engine version of Double Dragon II: The Revenge was also released exclusively in Japan, which was published by Naxat Soft on March 12, 1993. Released in Super CD-ROM² form