Got it, Each blue square represents same square button (4 x 4 blue squares = 4 x 4 buttons,) follow the path of the white line (not literally on the white line but on the square buttons., 16 buttons in 4 x 4 grid 1,2,3,4 etc, order is 15, 11, 12, 16, 8, 7, 6, 10, 9, 13 , 14 , 1, 5, 2, 4, 3) good luck 🙂
