I have three games that have been bugging me.
1 - A game I used to play all the time as a kid in the late 80's / early 90's at school, on the old Mac computers. It was similar to the other educational games at the time, like Number Munchers, Island of Dr. Quandary, and Oregon Trail. In this game you were a miner exploring caves, and you had to explore in the dark to find light switches and turn on lights. They would then flicker or break and you would have to go fix them. You had a pet bat that would be able to see in the dark and tell you what was around. As you explored, you would find certain items (a battery, a blender, fruit, etc), and at the end of each stage you would come across some sort of puzzle blocking the next area. For example, one I remember was some sort of monster (a dragon I think) that wouldn't move unless you made him a drink, so you had to figure out how to put your items together in the right configuration to get him to move.
2 - A game a played in the late 90's. It was a PC adventure game where you were a scientist on a research lab on Mars or something. There was a murder, and you had to try and figure it out. Turns out there was some alien parasite infestation, and if I remember correctly, you had to blow up the base at the end and escape.
3 - Another game from the mid-late 90's, I remember getting a CD with a bunch of demo games to play. My favorite was this on-rails game where you were in a spaceship and had to complete these track courses. They would get more difficult as you went further down the track, and you would have to be quick about moving to the next side and avoiding the gaps.
Edit:
I finally found #1 through Google. The key was searching for "electrician" instead of "miner". The game is Electrifying Adventures.
#3 was answered for me by RelativityMan. The game is SkyRoads.
Still looking for #2.