Early Game Hell

4 vs. Satan:
*Some of the earlier dungeons are seriously hard to beat. Starting with the paralysis cave the monsters aren't too hard to beat if you equip the heroes good enough, that is.
Alex in Princess Quest:
*NONE
The Stone of Power:
*TSoP 2: The "Hard Mode". But not because of the enemies being too strong, but because of lacking of money. In order to beat the first dungeon, you have to buy some of those stuff, then beat both bosses and only then can prepare properly.
The Three Kingdoms
*Inverted. The later game bosses and/or main enemies are harder to deal with.
Dragondawn
*Advanced: The first few bosses are tougher than in the main game and therefore harder to beat. The later ones are beefed up as well, but at that point people can prepare.
Harter Knall
*NONE
Hero Story
*Some of the earlier dungeons can be seriously hard to beat. The later ones with enough equipment, on the other hand, can be easily trashed.
Kill the Demons
*NONE
Satan Saga
*NONE
Story of Hero:
*NONE
The Legend of Devils
*Downplayed. While some of the earlier enemies are damn tough, some of the later ones are powerful as well.
The Sidestory Duology:
*NONE
The Time Of Bloody Fear:
*NONE