The new tile will appear on the top of the box.Change the position of the tile and make it down.If the sum of numbers on a column or row is equal to 5 10 or 20,they will merge together.When two 5 10 or 20 tiles touch, they will also merge into one.

feature:
· Use right or left key to move the top tile.
· Use up key to change the position of the top tile number.
· Use down key to put the tile down.