Merge Number Plus play online

How to play
You have 5 hand cards in the beginning.
Drag the first card in the Hand Card Area to any card in the Chessboard
Area. when the hand card meets the card on the chessboard, numbers
on the chessboard card will change to the sum of numbers on both
cards.
Three or more adjacent cards of the same number will trigger a tripleclear,
and then merged to a new card with its number plus one.
Upon each triple-clear, you will get a new hand card.
You can hold up to 5 hand cards.
When the quantity of your hand cards drop to 0, the game is over.