Willow

 quickest way to happy exp: head below Bavmorda's castle to a scene with
two ghosts. Let 'em divide once and then hit them with thunder magic. Each
ghost is worth 100 exp and also leaves a magic ball. Repeat as needed.

to Kael: rtw fPP Bj9 mb? ISq H7h
to Bavmorda, level 15: Mo! aCC vei Nxg I5D knV

Warp around:

First, enter the code:

oBH jq2 xgI 5ve iNw g5f

You'll start the game at level 16 nearby Nockmaar, but more importantly 
if you press Select once you get into a game screen, two white blocks 
appear allowing you to warp to various locations in the game. Hold down B 
and move the pad up and down to change the first number; hold down A and 
move the pad around to change the second. After selecting the desired 
coordinates, hit Select, and you'll warp around. Here are some example 
coordinates:


0,18 - the gates of Nockmaar
A,9  - Tavern of the Travelers
F,19 - Tir Asleen
13,F - Dew
1A,E - Newlyn
13,3 - Po's house
8,3  - Twins Tower
C,10 - Thunder Cabin
18,1B- Abang's room
0,13 - Bavmorda's guard
11,1B- Bavmorda

Experiment to find other locations. Note that some locations you type in 
may cause the game to crash.

**********************************
taken from TSR's NES Archive
http://www.komkon.org/~tsr/codes/
**********************************

Tsr.  TSR's NES Archive.  (1997): n.pag.  Online.  Internet.  4 Sept. 1997.