Keys are needed to open Pirate Chests on the second part of the island and are a quest in upgrading the Bridge. You can obtain keys by buying them from tourists on the second part of the island. Tourists visit that part of the island only when you have at least one building on it. Once you have been offered a key you will have to wait at least 160 minutes (2:40:00) before you will be offered another Key. This allows 9 possible collections every 24 hours. Below you can see what your odds are of obtaining the keys.
| Tourist bubbles | Relative appearance | Pay them | Receive |
|---|---|---|---|
  |
Both 29.5% | 20  |
10  , with 66% probability, or1  Iron Key, with 34% probability
|
  |
Both 11.5% | 10  |
1 Iron Key, with 66% probability, or 1  Silver Key, with 34% probability
|
 |
Both 9% | 5  |
1 Silver Key, with 66% probability, or 1  Golden Key, with 34% probability
|
| Dropped item | Total probability |
|---|---|
| 10
|
39% |
| Iron Key
|
35% |
| Silver Key
|
20% |
| Golden Key
|
6% |