Double Dragon 2 walkthrough (Nes): Mission 3 - Battle in the chopper

Finally, Billy and Jimmy Lee manage to catch the helicopter. Hold it! You'll never escape us! G.R.A.S.P. The chopper escapes into the Neon-filled night. The chopper escaped into the Neon-filled night.
This level is the shortest in the game and, above all, the only one with a fixed background (and the music isn't great). It would have deserved reaching the cockpit like on the NEC version for example. A little tip: if you risk falling because the door is open and you are nearby, just press Start. Leave it on pause for a few seconds. Press Start again to unpause and there, magic: the door closes immediately (but that's cheating).

Since the level is quite short, you have little chance of dying other than by falling through the outer door. The best thing is therefore to stay near the left door to fight if you don't want to lose any lives. Otherwise, you can always fight nearby to save time since enemies on the ground are sucked out.

The Bosses of Level 3 of Double Dragon II on Nes - Abobo

This level ends with a boss well known to Double Dragon fans: Abobo. He has the particularity of being able to throw you far behind him over his head. If you place him with his back to the door to push him, you are therefore taking a risk. However, it is also quite easy to make him go through the door, especially since if he ducks to avoid your jump kicks, he won't be able to resist the suction of the door.

Once the 2 big guys are defeated, you move on to level 4.