You can't. Unless they decide otherwise but I think they will pretty much be a thing of the past.
Howrse does not have promotinal codes unless you buy a packet of cards.
Howrse no longer does codes.
if a friend emails you to come join mathletics then in the mail it has a promotional code and you type it in as you purchase it at the moment theres one for worlds maths day and the code is WEG2011
You do not need a code to register a horse on howrse. You make an account.
There are currently no available promotional codes for Howrse.
no
The url for the international howrse is linked below and you can reach the others from the site.
no
yes. it is.
there are none
Nuutin
Ask nicely