No idea how good these are but here you go...
So this crisp packet promotion in the US has gone wrong, you get codes from the back of crisp packets. Anyway the website's glitched so you can use the same code as many times as you want.
1) Go to this website:
http://goo.gl/fucBh
2) For bag 1 enter:
564105307
Timestamp: 11:11
For bag 2 enter:
565105326
Timestamp: 12:05
3) Enter details, include a real but secondary email in case you lose the code for the game (they email it to the address provided)
4) Enter the code/s here:
http://goo.gl/eU41T
5) Repeat 1-4 to get the other game
Use 90210 as the zip code
Literally just done this and got both games!