Right now I am completely hooked (again) on netHack. For those of you who don't know, netHack is an adventure game that is really basic, but incredibly detailed. The program is so small that it could be run from an old 1.44Mb floppy. The graphics are all ASCII, but the gameplay is awesome.
Some of my recent exploits include:
I had a knight character. I trained my pony to steal from shops. When I died, I had over 20 wands in my possesion. I died because I found a scroll and tried reading it. It teleported me to another room where there was a monster that stunned me. I was then killed by two coyotes.
With that same character, I dipped my starter, +1 long sword into a fountain. A hand reached up and took it from me and handed me Excalibur. Of course, it didn't help me when I was stunned.
My last character attacked a floating eye. Stupid thing to do. It stunned me and I was killed by something incredibly puny (a hobbit, I think).
I tried drinking from a fountain at about level 6. A water demon came out of the fountain and started attacking me. I ran. I used a wand to slow him down. I threw everything I had at him while running, but couldn't kill him. Out of desperation, I started drinking potions. The second I drank turned me invisible. Even though he could detect me, I was still able to get away from him and run away. I later died a stupid death.
NetHack is known for YASD (yet another stupid death). It's a great game. You can get it with Windows interface (it actually has graphics - though very rudimentary). Download it here:
http://www.nethack.org/v343/ports/download-win.html If you try it, go to the home page (from that link) and read the guide. It's long, but it will get you started. There are tons of spoilers out there, but try not to read them before trying the game on your own. Try everything in this game, because it is commonly known that the developers think of everything.