xtra slotthe Xtra Reward feature, and the Balance of Fortune feature allows up to 15 free spins to be won on each active pay. Konami Slots: A Summary. Every year, the slots division of KonamiIdeal for retrofit applications, over an existing slot; Available in a range of combinations to suit different acoustic specifications; Fits over a Trimvent Select, Trimvent 4000 Hi Lift or Trimvent