On the slot machine, a slot game including a base game and free games is caused to proceed on a display. On the base game reel strips, on all of a plurality of reels, symbols whose each kind is the same, other than feature symbols and wild symbols, are arranged in succession. On the free game reel strips, on all of a plurality of reels, symbols whose each kind is the same, other than the feature symbols and the wild symbols, are arranged in succession and in addition thereto, only in a case of top symbols whose payout multiplying factor is the highest, the top symbols whose number is larger than a number of top symbols displayed on the base game reel strips are arranged in succession.