You have to direct the falling columns to make 3 or more same numbers adjacent to each others only horizontally or vertically. Then, their sum will be converted to the nearest number in the series (2, 4, 8, 16, 32, 64, ...), It’s the repeated multiplication of number 2.
It’s game over when there is no space for the falling column to land.
It’s a beautiful and addicting game especially when the adjacent numbers are falling in a way similar to the falling dominoes.
If you are left-handed: you can change the position of the buttons to the left of the screen by touching the hand icon in the main page.