good PC vidya for offline long term?

i just moved out of my dad's house and into a mediocre trailer in a trailer park . the amenities are fine and the owner does a good job of screening the ghetto trash out , but naturally the wifi has trouble reaching all the way to my PC , which surprisingly enough the camper can power with no problem.

for the next year or so my internet use will be restricted to simple web browsing . it's not usually much of a bother since during the week i'm too busy, but i like to have some video games to play on saturday when my workplace isn't open. with this in mind, what are some good vidyas for offline playing?