There is no way to do that. If your school has blocked the site, you can ask them to unblock it, but there is no way to get around it.
Howrse no longer does codes.
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
Contact the school network administrator for assistance.
The url for the international howrse is linked below and you can reach the others from the site.
there are none
no
yes. it is.
Ask nicely
there isn't one
there are none