Dwarf Fortress

I just got into this game dwarf fortress. It has very simple graphics and a steep learning curve but it's free and very rewarding. Here's a link:
http://www.bay12games.com/dwarves/

Paybox

So I found this site off someones blog and apparently this site will apparently give you 20$ for joining. Here's a link:
http://www.paybox.me/r/samlazanis
Not sure if it's a scam but you only need to put a name, email and password.

More Minecraft

For those of you who don't have minecraft you can get it free here:
http://freeminecraft.me/
You need like ten referrals or something. I'm not sure how it works but I'm sure you guys can figure it out.