User blog comment:Wildcats11630/How do i get Harley quinns revenge to work on the xbox./@comment-3075253-20120602050610

1-Check in the XBOX LIVE Marketplace to make sure you downloaded the DLC pack

2-If a "checkmark" appears next to the DLC pack, you have successfully downloaded it

3-If there is no check mark, click the "download again" option under the DLC

4-After it has finished re-downloading, go to your current saved game

5-The DLC should appear as a separate mode on the page

6-Hope this helped, and have fun playing Harley Quinn's Revenge! :D