Demon Hunter is a cancelled action RPG in the vein of Diablo, that was in development for Game Boy Advance by Independent Arts Software in 2002. The team planned 8 huge areas to explore, each one divided into several procedurally generated sub-levels so you had a different layout every time you would play.
As we can read in an old preview by IGN:
“Even though the game is designed with an ending in mind, players can continue to dungeon-hack through the areas after the quests have been complete, fighting increasingly difficult enemies the more advanced the players’ abilities become.
Like in most RPGs, players level-up their character as they battle through the different areas, earning experience points with every death. The game also features a fog-of-war type element used in real-time strategy games, limiting the player’s visibility so that he cannot see hazards that are coming from far ahead or behind certain objects.”
At the time Demon Hunter still did not have a publisher, so we can assume they never found one and the project was quietly cancelled, forgotten by everyone.