There may be many friends of Double Dragon Gaiden who still don’t know about the triggering conditions for the full ending of Double Dragon Gaiden: Double Dragon: The Sea. Next is the "List of Triggering Conditions for the Full Ending of Double Dragon Gaiden: Double Dragon Leaving the Sea" compiled by the editor of Sourcecode.com. Children who have questions about this, please take a look below, it may be able to help you.
After defeating the four major gangs, the mayor will give you money. If you choose to accept it, you will unlock the "Peacekeeping Team" ending. But the truth behind it is far from that simple. What if you don't accept the mayor's money?
With this question in mind, I played the plot again. This time I chose to refuse the money. The mayor will ask a few people to leave New York. Then I can choose the hidden level "City Hall".
The difficulty of the City Hall is very abnormal. Waves of enemies appear one after another, and they are fully armed for high attack and high defense. Many enemies are also equipped with firearms for combat.
What's even more ironic is that in the current background story of depression and decline, the city hall is dazzling and resplendent, and gold bars will explode if the objects in the scene are broken. The metaphor here is very meaningful.
At the end of the level, the leaders of the four major gangs defeated by the player will attack together. It turns out that the mayor is the boss behind the scenes. Although this setting is very cliché, it also brings a higher challenge to the game.
These contents are summarized from the fact sheet, and I believe they can answer your questions on this issue. There are more high-quality guides about Double Dragon Gaiden on this website, you are welcome to check them out at any time.