Game-Breaker

4 vs. Satan:
*NONE
Alex in Princess Quest:
*NONE
The Stone of Power:
*The Stone of Power 2: During the later dungeons the amount of money is insanely high, it's possible to boost most heroes to ridiculous levels. While the game is beatable without, it only adds to some catharsis.
The Three Kingdoms
*NONE
Dragondawn
*The three dragons attempt an apocalypse, but are too Always Chaotic Evil.
Harter Knall
*NONE
Hero Story
*As with TSoP, during the later game the amount of money is high enough to boost most heroes to ridiculous levels.
Kill the Demons
*NONE
Satan Saga
*NONE
Story of Hero:
*NONE
The Legend of Devils
*Invincibility spell. If you boost both attackers often enough, Satan could be CRUSHED by those attacks. (Unless Satan uses "Death" (which has a 9000 HP damage even with the Magic Shield).)
The Sidestory Duology:
*NONE
The Time Of Bloody Fear:
*NONE