JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You can take advantage of our conditional logic (Show/Hide Condition) to hide a section of a form and only show it based on the correct information supplied. For example: http://www.jotformpro.com/form/42813259506961. Enter "123" in the passcode box to reveal the submit button.
Here's the conditional logic settings:
You can also group fields, this guide: https://www.jotform.com/help/196-Hide-or-Show-Multiple-Fields-at-Once.
If you require any further assistance, feel free to contact us again.