After melding your hand/tiles, you can add "addable tiles" to the combinations in the middle.

Еxample! If there are 2 yellow, 2 red, and 2 blue tiles open in the middle, the 2 black tiles in your hand become "Addable tile", and you can add them to the middle. You can take the "addable tile" from your board and add it by directing it to the combination you want to complete.

IMPORTANAT! If you throw the "addable tile" to the next player, you will receive 101 penalty points!