<human>: Can you provide a brief overview of the text?

Yeah, he wants to play video games too and all I have is some classics like:

Postal 2: STP;
Duke Nukem 3d: Atomic Edition;
Myst (He doesn't understand this one)

There are a few more like this (morrowind for example) but I don't see where these are good for him.  I remember some kick ass games I played as a younger teen that he would like but only faint memories of what happened, no names.

Good easy puzzles, friendly and fun interface and reactions (Like some dude talking to him in the corner telling him what to do EG: "It looks like the button on the wall opens the door") would be good.  Anything else you may have good memories of from childhood or even with your own kids would be great.

Please, no flash games on a website though.  I'd prefer to download something to run easily so when I'm at work he can just click and launch.  Also, free is good.  If not free or obtainable by questionable actions, please make it cheap or worth the money.  

I know I'm asking a lot, but this is important to me.  All I have to teach this little guy when I'm not at work is TV and video games.  I make minimum wage so day cares and the like aren't an option (if there even were any in my area).

*

Thank you in advance for not downvoting without a reply.  I'm hoping this will be the first reddit post that doesn't begin and end with that.
<bot>: Need a good, cheap game that will help teach my son anything that isn't pissing on people and hitting a cop in the face with a shovel.