Yep, Jim is right, Dungeons of Daggorath.
0. This game is really old. Because I hate you all.
1982
1. Mmm, isometric-y.
One of the first, if not the first, isometric dungeon games
2. Color? Well I guess you could say that...
Despite its name, the TRS80 Color Computer, could only produce a whopping 8 colors. The drawing abilities were pretty advanced for its time though!
3. I'm expanding my vocabulary!
The game had potions with names like Hale, Rime, and Thews. I totally had to dictionary.com that shit, except dictionary.com HADN'T BEEN INVENTED YET.
4. If my heart beats any faster, it's going to explode.
Instead of hit points, you just had a beating heart. It would beat faster from moving, attacking, and getting smacked by monsters.
5. There was a sequel to this game called Castle of Thaggorad.
That didn't stand up to the original game. Which by the way was programmed in only 8K. Take that modern programmers!
Anyway, check it out on Youtube. It's surprisingly deep for its time.