To get started, you need to complete several tasks from Naomi, until she informs you that a mysterious island has appeared nearby that needs to be explored. Follow Naomi's advice and you can take part in a Match 3 mini-game.
You need lives to start the mini-game. Their number can be seen at the top of the screen. If you fail, you lose one life, so be careful! Lives are restored over time.
When you complete a level for the first time, you will receive a special resource (Emerald Turtle), which can be exchanged for unique buildings.