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Hidden Harbor is the thirteenth and secret episode in Angry Birds Rio.
To access the episode for free, do the following steps.
- Go to Level 14 of Timber Tumble.
- Launch Chuck to the left of the slingshot, letting it roll along the branches. When it reaches the bush at the end, you should find it.
You can also buy it for 300 Bird Coins in the Rio 2 menu.