Goodbye 8th Year Event Goals Fix
A fix is now live. An additional goal, Earn 5 Stars, has been added. Completing this will grant the additional 500 RP to complete the reward track.
To add to Tygris' post, the Map Editor is accessible at right-centre from the game's main screen: it's the symbol of two arrows crossing to form an 'X' (see the image in this post as an example).