What's the name of that 80's dungeon crawler game that is like Gauntlet, but not Gauntlet?

It's not Gauntlet, but the game play looks a lot like it. I can't remember the name of. It was 2 player co-op game. The enemies include rats, minions, and vortexes. You collect keys and throw daggers. 99 levels, even came with a decoder wheel that when given a "code word" you had turn the wheel until you saw the word, and it showed a series of letters that allowed you to continue to the next level. We played it on a IBM clone. (the vortexes stole your keys) Someone told me the name might have dungeon in it. like someones dungeon. But it's not Dragons, Dandy's or Linley's. I know that's a lot, but i'm stuck, please help.