Top Voted Answer
You can see the whole endings at (SPOILERS!) http://www.vazcomics.org/mamend/gamend/nes/bubblenes.htm
Freegamer - 8 years ago
There are two conditions to get the real ending.
1. You have to have gotten the bell and the door on level 99
2. You have to beat the boss with both players alive
The easiest way to do that is to have player 2 leech a life while the boss is in his bubble or to just play with 2 people.
Lokarin - 8 years ago
The link provided by Freegamer covers it.
A couple details not clear in those pictures:
-When you get the real, final ending, the final boss explodes when you pop the bubble instead of just flying off the screen.
-A sound test appears after the credits.
sword_of_dawn - 8 years ago
This question has been successfully answered and closed.
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