Wis. Stat. § 100.17
No person or persons or corporations in their own name or under any assumed trade name, with intent to defraud, shall advertise or represent in printing or writing of any nature, any enigma, guessing or puzzle contest, offering to the participants therein any premium, prize or certificate entitling the recipient to a credit upon the purchase of merchandise in any form whatsoever; nor shall any person or corporation in the printing or writing, advertising or setting forth any such contests, fail to state definitely the nature of the prizes so offered; nor shall any person or corporation fail to state clearly upon all evidences of value issued as a result of such contest in the form of credit certificates, credit bonds, coupons, or other evidences of credit in any form whatsoever, whether the same are redeemable in money or are of value only as a credit upon the purchase of merchandise; nor shall any person or corporation issue to any person as a result of any such contest, any instrument in the form of a bank check or bank draft or promissory note or any colorable imitation of any of the foregoing; nor shall any person or corporation refuse or fail to award and grant the specific prizes offered to the persons determined to be entitled thereto under the terms of such contest, or fail to redeem any credit certificate, credit bonds, coupons or other evidences of credit issued as a result of any such contest, according to the terms thereof.
Wis. Stat. § 100.17