We have Search engine exclusion upgrade in which you can hide your contest from search engine crawlers i.e. design contests which have this feature activated are not indexed by search engines.
After using this upgrade your contest will not be visible in search engines like Google, Yahoo and others.
You can activate this feature through two ways:
1. While launching any design contest, you can add the S.E. Exclusion upgrade under the "Promote Contest" section.
2. Once your contest has been launched, you can click on the "Upgrade" button below your contest name. A popup will open, through that you can choose the Highlight contest upgrade and make the payment to activate this feature.