GoCodes Plugin Alternative

Hello,

I'm looking for an alternative to the GoCodes plugin which appears to be out-of-date:

http://wordpress.org/extend/plugins/gocodes/screenshots/

I would love to be able to create a Key, a Target, and then add an "Enter Your Access Code" form on my WPMU's home page.

Any suggestions, recommendations, or ideas on how to replicate this functionality?

Thank you in advance :wink: