HexCheats:

 All you have to do is to hex edit the file chaos.exe. But be carefull
 this file is crunched. So uncrunch it first (use UNP or a tool like
 this) and then load into the hex editor.

 Search for 26 28 44 48 and you will find 4 occurance of this group.
 Change the last 2 times to 90 90 90 90. Now you have unlimited lifes.

 Go to sector 84 offset 351 - 353 and change 66 89 04 to 90 90 90. Now
 your money won't be reduced in the game.

 Here are some level codes for a few combinations of characters.

 Navvie and Preacher

 World 2: XJ82LM6PDG1P
          W0FN2FVSN2RS
 World 3: Q2HG3VTYWJ3X
          T2FRNCJZ41K2
 World 4: RCQ3SH#23X3K
          5JHK5W4FVBHW

 Mercenary and Gentleman

 World 2: 8MHT98QKMYG7
 World 3: V3Q2QHKHNVQ9
 World 4: P2CBL7CS0LK8

 Brigand and Gentleman

 World 2: CHHT982R60YC
 World 3: R0CK1H286IHR
 World 4: 40Q9Y3LN1L0B

 Gentleman and Navvie

 World 2: 8MHL2KSYYG#S
 World ?: 4WT3R2B4Q3J8
 World ?: N1GH9LOLT3LH