Editing android phone's build.prop?

Who the fuck cares about mobil phones? Use your fucking PC!

1: change the name to something relevant...

2: you can use many editors depending on the level of coding you know... if you are decent to advanced then you could prob do it in notepad++, just making a copy of the file before you do it and lastly

3: if your android device doesn't allow for something to be played there is usually good reason for it, like the fact that it does not have the system requirements (this goes especially if you are checking through android's google play store)

Well, at least you were being honest. No free Skyrims here... What a disappointment :(

Probably not the best place you should be asking.
XDA is where I would start.

open file build.prop with a text editor and change the line

ro.product.model="name of android device" (without quotes)

You can see here or here if you need more details, tweaks and optimizations

I personally use this thread, always worked for me. Make sure to backup your original build.prop (pretty sure it tells you how to do that on the link :) )
Modify build.prop to look like a Nexus S or Droid 3 for more market access