You will meet Menes’s curse at level 14.
When Menes’s curse is active you will see purple crystals all over the city.
When Menes’s curse is active you will not have the access to the new buildings.
Your main task will be to remove the purple crystals from the city. To do it you need to complete two islands (match-3 rounds) in the ship.
If the ship is locked you need to have XP level 14 and complete the tasks with the ship image. Make sure to solve the quests which are marked with a little blue ship icon in the corner - they will lead you to the final ship quest.
Please note that it can take time to play the game - challenges can't be completed right away.