The number of lines the machine will pay on depends on the amount of coins deposited. One coin only may pay the middle line, if you hit a winning combination on a line that has not been activated, you win nothing. A second coin will pay the top line as well, a third coin - then the bottom line, so now any of the three horizontals will pay should a paying combination be hit, a fourth, the diagonal and a fifth, the other diagonal. Read the machine, find out how many lines to play, pay, and win. Anywhere from three, five and into the twenties. .