Originally released on video cassette, Nightmare or Atmosfear (depending on region) spawned five games in it's original run and two games in it's secondary run. This era is best known for it's Gatekeeper, played in English language versions by Wenanty Nosul.
Original VHS Series
Nightmare/Atmosfear | Zombie | The Witch | The Vampire | The Mummy
Second VHS series
The Harbingers | Booster Game Tapes | The Soul Rangers | The Ultimate Conflict