CHEERIOS CHALLENGE STACKING SWEEPSTAKES OFFICIAL RULES NO PURCHASE NECESSARY TO ENTER OR WIN. A PURCHASE WILL NOT INCREASE YOUR CHANCES OF WINNING. Sponsor: General Mills Sales, Inc., One General Mills Boulevard, Minneapolis, MN 55440 (“General Mills” or “Sponsor”). Administrator: Arrowhead Promotion & Fulfillment Co., 1105 SE 8th Street, Grand Rapids, … Continue reading Cheerios Challenge #StackingSweepstakes Official Rules