By matching four crystals of the same color in a row, you will receive a Lightning bonus that can remove all chips in a row or column. To activate the Lightning, make a combination with it.
By matching five crystals of the same color in a T or L shape, you will receive a Bomb bonus that clears all adjacent cells. The bomb goes off twice. To activate a bomb, make a combination with it.
By matching five crystals of the same color in a row, you will receive the Supercrystal bonus. Match the Supercrystal with an adjacent one to remove all crystals of this color from the field.