Double Dragon

Additional moves:
Accumulate 1,000 experience points, as noted in the counter the bottom left corner. One additional heart and a new move (in the following order) will be awarded.

Uppercut
Jump kick
Hair pull
Pin attack
Elbow punch
Spin kick

Hint: Defeating Chin easily:
The level two Boss, Chin, can be defeated by quickly climbing down the ladders after he appears. Keep climbing downward until the end of level music is played.

Hint: More experience:
Begin game play and reach mission 2. Get the baseball bat from the opponent that is on top of the fence. Next, jump off the fence and let the two thugs come after your character. Get the top thug to come to the end of the red pipes at the top of the screen. Once he is at that location, run up the fence and move all the way to the end of it. Then, turn around, jump back off the fence, and go to the end of the pipes. Although no opponents will be in sight, start swinging your bat at the end of the pipes for more experience and faster move learning.
Information in this section was contributed by Jesse Smith.

Hint: Weapon changes:
When you kill someone that has a weapon, do not take it, but stay nearby. When you kill everyone else on screen, pick up the weapon at the same time that the "thumbs up" appears. If done correctly, it will change into a different one. This may require more than one attempt.
Information in this section was contributed by tali peyser.

Hint: Head butt:
Quickly press Forward(2) to do a head butt at your opponents.
Information in this section was contributed by Benjamin J Nichols.

Glitch: Looping level:
Toward the end of Mission 1 (after you beat up the men with the barrel) you will reach a door and two girls with a jump rope. Keep walking to the right until you reach the wall, where there are two vertical bars. Press Up and you will walk up the wall. If you press A, B, or A + B, you will get hurt and fall off the wall. If you keep going up off the top edge of the screen, you will loop back and come up from the bottom.
Information in this section was contributed by Asynchron.

Glitch: Looping levels:
In Mission 3, after fighting the two Abobos that bust out of the cave, do not go into the cave but continue going to the right. You will return to the beginning of Mission3 and all the enemies will have respawned.
Information in this section was contributed by a CA dude.

In the Mission 3 cave, when you reach the moving platforms, jump onto the first one but intentionally miss the second and fall. You will enter a small cave area with two Ropers and a boulder to throw. After defeating them, move to the right and you will return to the entrance of teh cave, and will have to dodge the falling stalactites again.
Information in this section was contributed by a CA dude.