1) Firstly Goto mobile.twitter.com/UnlockPureMagic Offer Page
2) Follow Them on Twitter ( every new follower gets the prize).
3) You will get a Golden key from them in DM ( Direct Message )
4) once you get the Golden Key
5) goto unlockpuremagic.com/and enter your golden key, Name, Address, email id, Phone and pin code and submit you will get free Britannia pure chocolush pack of 5