What are these grey colored tiles?

The grey colored tiles that gets sent to your board from time to time are disrupting tiles called: "Null Tiles".

There are card(s) in the game that has a specific ability to make one of your tiles on your board into a Null tile.

These tiles can be removed by matching 3 or more Null Tiles together and WILL count toward your combo chains.

However, do note that by popping these Null tiles, your cards in your deck during a match will NOT gain any level or benefits from these tiles.

Current card(s) that associates with this ability are as follows:

• Wulfgar the Grim