Passwords for Beyond The Dark Portal
The first password is for Humans, the second for Orcs
Level 01 - LLRSJR / SLYRFT
Level 02 - BTTLFR / SKLLFG
Level 03 - NCMRNT / THNDRL
Level 04 - BYNDTH / RFTKFN
Level 05 - SHDWSS / DRGNSF
Level 06 - FLLFCH / NWSTRM
Level 07 - DTHWNG / SSFZRT
Level 08 - CSTFBN / SSLTNK
Level 09 - HRTFVL / DPTMBF
Level 10 - BTTLFH / LTRC
Level 11 - DNCFTH / YFDLRN
Level 12 - BTTRTS / DPDRKP

Passwords for Tides Of Darkness
The first password is for Humans, the second for Orcs
Level 01 - HLLBRD / ZLDR
Level 02 - MBSHTM / RDTHLL
Level 03 - HSTHSH / RCSTHS
Level 04 - TTCKNZ / SSLTNH
Level 05 - HTLBRD / RCTLBR
Level 06 - DNLGZ / BDLNDS
Level 07 - GRMBTL / FLLFST
Level 08 - TYRHND / RNSTNT
Level 09 - BTTLTD / RZNGFT
Level 10 - PRSNRS / DSTRCT
Level 11 - BTRYLN / DDRSSQ
Level 12 - BTTLTC / TMBFSR
Level 13 - SSLTNB / SGFDLR
Level 14 - GRTPRT / FLLFLR

Cheats
Start a game with either Human's or Orc's,
Go to the password screen and enter these passwords to get the following:
TSGDDYTD - invincibility
THRCNBNL - finish the game
MKTS - faster productions
NSCRN - reveals map
VRYLTTL - upgrades magic and gives you all spells
DCKMT - upgrades everything to maximum possible
NVRWNNR - lets you continue playing even after you've achieved your goal
YPTFLWRM - makes you lose the game
VLDZ - gives you 5,000 oil

You must go back to the game after each one you enter is finished and it will enable the cheat.

More cheats to be entered at the password screen
HTCHTXNS: Gain lumber
NTPRF: Laser show
GLTTRNG: 10,000 gold, 5000 lumber and oil
NGLS: Disable magical traps (runes, ect.)
NTTCLNS: Instant victory