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Increase the level of tiles by combining them.

HOW TO PLAY:
Click on one of the tiles to combine all adjacent tiles, one level, into one.
After each merge, a new tile with level 1 or 2 will appear in an empty space.
When tiles with the same level number touch each other, they merge into one. 1 and 1 = 2, 2 and 2 = 3, 3 and 3 = 4, 4 and 4 = 5, etc.,
You can combine from 2 to 5 tiles.
For example, 1 + 1 = 2, 2 + 2 + 2 = 4, 3 + 3 + 3 + 3 = 6, 4 + 4 + 4 + 4 + 4 = 8.
The level of the tile rises, not the sum of the level numbers.
When there are no options for combining tiles with the same levels, you lose.