Hey! I found two guest passes while cleaning!
One is for Starcraft 2 and the other one is for World of Warcraft.
You get to download the whole game and make an account for free, but if you wish to continue paying, you'll have to buy the game.

This is for the one who haven't tried Starcraft 2 or World of Warcraft yet.

Starcraft 2 pass: HMBGWP-8VFY-DWYKB4-6ZFE-RE4GE2


World of Warcraft pass: 6J7MK4-KTRR-PMGXND-287B-V8FX7Z


Have fun!