This is a simple trainer I made using a program called Magic Trainer Creator.
Go to http://www.avault.com/cheat/ to download the program (it's somewhere in that site). Please don't email me if you have any problems with the Magic Trainer Creator as it is not my program and I am not a programmer (so I won't be of much help).
Simply start your FTA2 game. Once the gameplay actually begins, press ALT-TAB to get back to WIN95. Run the trainer and select your two options.
1. All HP = 255
or
2. Freeze HP = 255
Clicking on (1.) will give you 255 hitpoints to all three characters. And clicking on (2.) will freeze all hitpoints at 255. I recommend you select option/button (1.) first, and then (if you want to) you can select the freeze HP option. This will prevent any crashes which might occur.
When your HP is freezed at 255, the button will look like this:
NOTE: This trainer MAY NOT WORK on your version or copy of FTA2: Halls of the Dead. I made this trainer with the full install for the WIN85 version, so if it doesn't work, it is most likely due to these two reasons. If not, then see if you are following the instructions correctly. If it still does not work, then I unfortunally do not know what the prolem is, which means you're on your own.
I am not responsible for any damage using this trainer may do to you, your computer, or anything else you can think of. Not that it is intended of course.