The Sushi Cards use Trinket, an online code-editing platform, for creating websites. A number of example projects are available to guide Ninjas if they are stuck on a particular Sushi Card. The content of these examples are in English and may need to be translated for Sushi Cards in other languages.
Go to dojo.soy/trinket and click "Sign Up For Your Free Account" if you do not already have an account. You will need an email address to sign up.