The Sword of Hope, released in Spain, is a Game Boy RPG adventure, likely sharing many similarities with the German version. Further details on its development and release date are needed.  Gameplay probably follows the standards of Game Boy RPGs of the time:  exploration, quest completion, and combat.  Specific mechanics, such as the combat system (turn-based or real-time) and the nature of the quests, would need additional investigation.

Sword of Hope, The (Spain)

Swamp Thing (USA, Europe)