If you've never played 'Zork 1' before, give it a spin. As for myself, 'Zork 1' is the first interactive fiction game I've ever played. Maybe it isn't the friendliest game for beginners of IF, but I'm personally glad that I began with this clasic masterpiece.
What 'Zork 1' did well, in my opinion, is that it hooked me right away. The opening scene - and this is not a spoiler, it's the start of the game - where the player is placed in front of a mysterious white house is purely brilliant. My brother and I, who I first played this with, would brag to each other via text who made it furthest into the game. It was thrilling to text to him that 'Hey! I made it past the house!' or 'I did it - I killed (Spoiler - click to show)that horrible thief!'
So maybe it was the rivalry I had ongoing with my brother in playing this game that made it so exciting and gratifying to me on my first play, but 'Zork 1' really is clever when it comes to its presentation of exploration and surprise.
Don't miss this one.