If a red or black 3 is discarded, another card is discarded on top.
However, a meld can never have more wild cards than cards of the actual rank (EXAMPLE: P1 can add Jokers and 2's to their meld of three 9's, but they cannot add any more than three Jokers and 2's because they only have three non-wild cards in the meld).
Cards are scored according to their rank and quantity.