Here are the rules from the tim horton's website:
HOW TO PLAY
1. TO PLAY: Commencing February 26, 2007, customers at participating Tim Hortons locations in Canada and the States of New York, Ohio, Michigan, West Virginia, Kentucky, Maine, Connecticut, Rhode Island, Massachusetts and Pennsylvania (USA) may receive and roll up the rim on specially marked Tim Hortons medium, large and extra large size hot drink take-out contest cups*, while supplies last. Revealed inside the rim will be a "Win" or "Play Again" message. A "Win" message will describe the specific prize available to be won. To claim your prize, refer to instructions which follow, but to be eligible; all prize claims must be received by May 27, 2007, the contest closing date. *NOTE: In the United States, the cup sizes are referred to as "small", "medium", "large" instead of "medium", "large", "extra large" respectively.
2. NO PURCHASE NECESSARY TO PLAY: In Canada, obtain a FREE Tim Hortons contest cup and/or a copy of the official rules, by writing to: Tim Hortons Contest Cup, P.O. Box 9296, Saint John, New Brunswick, E2L 4Y8. In U.S.A., to receive a FREE contest cup and/or a copy of the official rules write to: Tim Hortons Contest Cup, Box 1315, Calais, Maine, 04619-6315.
All requests for a Free Cup must be postmarked by May 5, 2007 and received by May 13, 2007. Limit one request per envelope with sufficient postage, while supplies last. Void in Florida and where prohibited by law. No mechanical reproductions of requests permitted. All requests must include a postage-paid, self-addressed envelope.
CONTEST CUPS
3. A total of 270,237 cases of contest cups have been produced for this contest. These will be available for
distribution through May 5, 2007 or while supplies last, whichever occurs first. It is anticipated, based on estimated
distribution that contest cups will be distributed within 6 regions as follows: APPROX NO. OF CASES
(1000 CUPS PER CASE)
British Columbia: 18,164
AB,SK,MB,YK,NWT: 32,009
Ontario: 152,402
Quebec: 18,044
Atlantic: 38,259
USA: 11,359
14. Employees of, members of the immediate family of, or those domiciled with an employee of The TDL Group Corp., Tim Hortons Advertising and Promotion Fund (Canada) Inc., The THD Group LLC, The Tim's National Advertising Program, Inc., their affiliated or related companies (collectively "Contest Sponsor"), Tim Hortons franchisees, the advertising and promotion agencies of the Contest Sponsor, the independent contest organization and the contest cup suppliers are not eligible to participate. Employees of Tim Hortons franchisees as described in this paragraph are limited to those employees who are providing services in any way to the Tim Hortons Store. "Immediate family" is defined as parents, siblings, children or spouse.