The solution from HEROS QUEST by MATH CLAESSENS.

There are different ways to solve this adventure.I will give  you 
the solution with the FIGHTER.

Also a few tips if you use a THIEF:
You have to do the following things at night in SPIELBURG:
after you make the sign in the alley you get a password,go to the 
bar and say the password to the man sitting on the trapdoor.down-
buy licence-buy toolkit-play game-now go to the old ladies house-
pet cat-search couch-get candles-open purse-look in basket-search 
drawer-now go to the sheriff's house-get vase-move  painting-pick 
safe-get   coins-close  safe-replace   painting-search   desk-get 
candelabra-open  music  box-get music box-now go to  the  thieves 
guild and sell all the items you have stolen.

NOW WE START THE COMPLETE SOLUTION WITH THE FIGHTER:

Give the fighter also  climbing and magic.
Ask  about  brigands-ask about  monsters-ask  about  name-W-enter 
guild  hall-wake  man-ask about monsters-ask  about  brigands-ask 
guild  master his name-read bulletin board-read  book-sign  book-
leave  guild hall-enter magic shop-buy fetch-ask  about  erasmus-
leave magic shop-E-now walk East around the corner-buy apples-buy 
apples-buy  apples-buy apples-buy apples-ask  about  brigands-ask 
about  name-enter  dry goods-yes-buy  flask-buy  flask-ask  about 
brigands-leave dry goods-W-enter alley-give silver coin-ask about 
brigands-ask about name-leave alley-E-S-leave town South-E-E-N-E-
give apples-W-W-W-get rocks-throw rock to nest-(you can also cast 
fetch)-do this until you get something from the nest-knock  door-
ask  about  brigands-ask about name-give  ring-S-W-W-enter  magic 
shop-buy  open-leave shop-E-S-leave town-N-N-ask about  Elsa/Baba 
Yaga/Baron/Warlock/Leader/Brigands/Monsters/Name/Job-open 
portcullis-enter castle-rest until you are too impatient to rest-
ask about:weapons/Son/Lesson/-yes-E-walk to stable-yes-W-S-S-W-N-
N-N-N-E-N-get  flowers-cast  open-get  scroll-walk  to   tree-eat 
fruit-S-W-S-W-S-S-S-W-S-W-W-W-talk  to meep-ask about green  fur-
get  fur-get  scroll-E-E-E-N-N-W-N-ask about  deal-yes-ask  about 
rhyme-give gem-HUT OF BROWN,NOW SIT DOWN-enter hut-yes-run-S-S-S-
S-dance-ask about dust-get mushrooms-E-E-S-E-E-E-fill flask-climb 
rock-(if you can't do this now,try it later in the game,you  must 
onley   practice   some   climbing)-knock   door-sit-ask    about 
magic/spell/scroll/-yes-get  scroll-stand-leave-climb   down-(you 
don't have to do this to solve the  adventure)-W-W-W-W-W-W-sleep-
walk to tree-yes-run-E-E-E-N-N-N-N-N-N-cast fetch until you  have 
the seed-S-S-S-S-S-S-W-W-W-walk to tree-yes-get  acorn-run-E-E-E-
N-N-N-E-ask  about brigands/leader/field/name/-E-knock  door-give 
acorn/dust/fur/flowers/water/-ask   about   dispel    potion-give 
mushroom-leave   house-N-open  portcullis-open   portcullis-enter 
castle-ask  about lesson-E-yes-W-S-S-S-(NOW SAVE  YOUR  GAME,WHEN 
YOU  MEET BRUNO HERE,YOU CAN ASK HIM ABOUT  GOBLINS/BRIGANDS  AND 
EVERYTHING YOU WANT.THIS WILL COST YOU MONEY.IF YOU HAVE ALL YOUR 
QUESTIONS THEN LOAD YOUR SAVE GAME AND GO ON.)-W-IN TOWN  E-enter 
dry  dood  store-buy food-leave store-S-S  leave  town-N-W-W-W-W-
rest  until you are to impatient to rest-fight with the  goblins-
search  goblins-and  rest-now  you  have  some  more  silver  and 
strenght-N-E-E-N-N-E-N-E-N-get flowers-S-E-cast calm-enter  cave-
give  food  to bear-E-fight with the cobold-use  healing  potion-
fight with the cobold-get key-cast open-get gold-leave  room-free 
bear-leave cave-cast calm-W-W-S-S-S-S-E-N-open gate-open  gate-N-
N-ask about  brigands/Elsa/leader/warlock/-sleep-S-E-yes-W-fight-
S-S-knock  door-leave house-S-W-W-enter magic shop-buy  dart-drop 
scroll(5  X)-drop  flask (2 X)-drop food  (8  X)-S-E-N-enter  dry 
goods-buy armor-buy dagger (7X)-drop  flowers(5X0-S-S-S-S-W-rest-
throw dagger at brutus (7X)-cast dart(4X)-E-rest-W-cast dart(2X)-
(everytime after you throw a dagger or cast dart,go east and come 
back  west to throw the next dagger)-S-N-search man-throw  dagger 
(7X)-rest-S-W-W-S-unlock rock-use healing potion-move  rock-hiden 
goseke-enter  cave-drop  key-drop flask-(save your  game  and  go 
west,try  to  kill  the  troll,is  not  necessary  to  solve  the 
adventure,if you cant kill him well load your save game and we go 
on:)-from  the  first screen in the cave go  East-cast  calm-cast 
open-open gate-enter gate-past left-enter right bridge-jump  over 
rope-block   door-block  door-move  chair-move   candelabra-climb 
table-open  door north-ask  about  warlock/Elsa/enchantment/-ente 
door left (under the arrow)-enter smiley door-pull chain-go back-
enter door North-open door-hide under exit-open door-throw dispel 
potion-get  mirror-get  dispel potion-leave room  through  secret 
passage (chest in the right of the  screen)-N-N-N-N-N-W-N-yes-hut 
of brown,now sit down-enter hut-show mirror....
THE END....