Double Dragon

Hint: Defeating the Shadow Boss:
Avoid fighting the Shadow Boss' companions during that battle. They will automatically disappear when the Shadow Boss is defeated.

Hint: Walk on water:
In level 3, after the battle before the bridge, you will be signaled to cross it. Instead, press Up in order to get as high into the background as possible. Then, go right until you cannot go any further. Jumpkick and continue to do this as you go right. It will appear as if you are walking over the water below.
Information in this section was contributed by edwin nelson.

Hint: Sky walk:
Get to the point after the mid-level battle in level 3 after meeting these three conditions: be on your first life, get the bonus life, and once on the ridge which is over and next to bridge do not jump down. Hold Fire to punch and press Up. If you get stuck, just reverse directions.
Information in this section was contributed by edwin nelson.

Hint: Alternate ending:
When girl comes down from the wall, just as she gets to the floor press Up and press Fire on controllers one and two simultaneously and release. Let her move. Just before she touches the red carpet, press Up. If done correctly, she will go around your man and will hug and kiss an invisible man.
Information in this section was contributed by edwin nelson.