Double Bubble is an item in Merge Mansion. It is used on the Main Board.
Gameplay Tips[]
Double Bubbles are sometimes created when merging two items; they contain an extra of the newly merged item.
Opening a Double Bubble costs 
Gems, the amount of which depends on the item. By their nature as the result of a merging action, Double Bubbles cannot contain Level 1 of any item. However, note that other Levels of any given item may also be set up as incapable of producing Double Bubbles. The valid Levels and their associated Gems costs can be looked up on the individual item pages.
Double Bubbles can be cleared from the board by single tapping and using the Remove button, or by letting their timer run out. In either case, the bubble will convert into 
Gold Coins (L3).
The timer length depends on the gem cost of the item, and conforms to the following cost brackets:
| Min Cost | Max Cost | Lifetime |
|---|---|---|
| 1
|
14
|
1m |
| 15
|
39
|
2m |
| 40
|
99
|
3m |
| 100
|
299
|
4m |
| 300
|
- | 5m |