Puzzle giveaway for artists and scientists

It's time to listen to some acid music! I'd recommend either this, or this. One of them leads to a headache, and the other one to a hidden giveaway (and potentially a headache too). However, only those of both art and science can find it.

You will find two English words, which together describe an activity people do in some video games (this should work as a confirmation you got it right; if you get "qkrft aaeiz", you did something wrong). Use these words to complete a bit.ly address. For example, if the words are "peel" and "potatoes", go to bit.ly/peelpotatoes.

The giveaway should end next Friday, at midnight CET. Oh, and what game it is for? It's what happens when you have a screwdriver, and then someone screws with zombies. Er, I meant, replaces screws with zombies.

(Oh, and a disclaimer: although I am, technically speaking, a scientist, I got all my knowledge of this particular area of science from Wikipedia. So if the wiki articles I used were wrong, then you're zombied. I mean, screwed.)