AMP Codes (@AMPCodes) are redeemable codes that can be used to gain items in Pickcrafter.
Where to find AMP Codes: Edit
Visit the @AMPCodes twitter page (they will be giving out codes randomly).
How to redeem AMP Codes: Edit
If the Twitter page posts that the code stone14 will give you in-game stone then you enter the code and receive however much stone they have decided you will receive.
If they don't work for you then you've either already submitted the code or you don't have any internet connection!