1) How to use trainer:
It is very simple to use the trainer. Double click the dun_rid.exe file. Then start the game
(but don't close the trainer, it runs in background). Use the hotkeys to enable/disable cheats.
2) Hotkeys:
0: Unlimited Lives download the file: dungeonridertrn.zip
(to unpack archives use: WinZip,WinAce, WinRar)