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[Mister Ofdoom]

There are two usual methods to go through the walls, both are not very fair =)

First one is to find a trainer program that allows you to do so. I've never used them though so I can't say if there is any trainer for 1.02 or not.

Second one is Hex-editing. This is relatively easy and allows you making such different things as receiving new items from nowhere, 'teleporatation' between levels, additional HP and mana and so on. It is all cheating, of course.
Here is the way how to move yourself by cells inside level:

1. Start a new game. Make a save file of it. Exit game.
2. Open a hex-editing program. Open your savefile by it (The file would have the last number of all your saves).
Remember that 09+1=0A, 0F+1=10, not 09+1=10.
3. Find the line 00000250. There must be something like
'00 00 00 00 2d 02 80 0d 80 11 04 00 00 00 1b 00'.
4. To move yourself 1 cell north, change '2d 02' to '0d 02'. The next cell is 'ed 01', the next - 'cd 01' etc.
To move yourself 1 cell east, change '2d 02 80 0d' to '2e 02 80 0e'. I don't know why is it so, but it seems to work. To move east again, change the line to '2f 02 80 0f', then '30 02 80 10'. Then, to move, for example, north, change it to '10 02 80 10'.
The same mechanism must work at any level.
5. Save changes, exit the savefile, load the game.

By the way, my version is 1.00. I don't think its savefiles look so different. Otherwise, the line like '00 00 00 00 2d 02 80 0d 80 11 04 00 00 00 1b 00' has another number, but the method still has to work.