We have been offering task randomization for a while already, but until now it could have been done only by our Support Team in the backoffice.
Based on customer feedback and popularity of such requests, we have brought this feature to the UI. Now you can create randomized tests directly from your account.
You can read more about this feature and how to use it here.
Let us know if you have any feedback or would like to have this feature enabled for you - we are always happy to hear from you at support@codility.com.