Merge Stone is a joker item that you can merge with any item on the board. You can merge the Merge Stone with any item on your board and upgrade the item's level. Merge Stone can be used when you reach its highest (max) level. 
How can I find the Merge Stone?
- You can get a Merge Stone from the Merge Fever event, Safe Box, and Chests.
| Item | Level | Image | Use |
|---|---|---|---|
| Merge Stone | 1 | 
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- |
| Merge Stone | 2 | 
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- |
| Merge Stone | 3 | 
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- |
| Merge Stone | 4 | 
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- |
| Merge Stone | 5 | 
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- |
| Merge Stone | 6 |
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Merge with any item on the board to upgrade the item's level. |