Cheats:

hometaser - If typed at stats screen gives you 18 for all
shrinkiwannakill - If typed in game gives you ultimate sword
mesmart - if typed in game gives you all spells and all spell
scrolls - good for money Tarrasque

GameTips:
The manual and the hot-key card disagree on which keys
to use to sidestep left and right. The manual is in fact
correct: use the "Z" and "X" keys to sidestep.

Break things to find the goodies hidden inside, but don't
hack at things indiscriminately; you can break boxes,
tables, chairs, and benches, but some of them are there
for you to try climbing on; if you break them, you can
frequently find yourself with no way up.

Save often! Not only will you probably find yourself
dead often, but often when you get hung up somewhere,
going back to a save game is the only way to continue
the game.