Captive? No! you'll get hooked and lose your real life!
Go for Dungeon Master, it's the ultimate classic and every Amiga gamer should have played it at least once. Wild times mapping the dungeon, mashing monsters between doors, throwing clubs at them, creating endless potions and quaffing them down so you can make more just to improve your skills, getting the shit scared out of you when you turn a corner and are suddenly faced with an attacking mummy... What more do you want?
Okay, otherwise I would recommend Black Crypt and Crystal Dragon, both a lot of fun, better looking, more variety and with better sounds (and an automapper!)