"Colossal Adventure is a complete, full-size version of the classic mainframe game 'Adventure' with all the treasures, creatures, rooms and puzzles of the original. And we've added 70 bonus locations to the endgame. no one else gives you this."
This game was the first of the Jewels of Darkness Trilogy, the other two being Adventure Quest and Dungeon Adventure.
I'm not sure if it was released separately (apart from Jewels of Darkness).