The Seneca Niagara Casino voucher rules: 

Offer valid for up to two (2) $15 Free Play offers.  Limit one (1) $15 Free Play offer per person

Limit one (1) voucher redemption per person per day.  Promo Voucher valid through to December 30 2013.  Redeemable at Seneca Niagara Casino.  Once promo voucher is redeemed, actual offer valid period may vary.  Promo Voucher has no cash value.  Offer non-negotiable and non-transferable.  Valid Government-issued Photo ID required.  Seneca Players Club membership is required.  Membership is free to join.  Offer not open to persons less than 21 years of age.  Seneca Gaming Corporation employees are not eligile to participate.  Seneca Gaming Corporation management reserves the right to cancel, revoke or modify this offer at any time.  Void where prohibited by law. Other restrictions may apply.