I got a different one.
Get a free night certificate when you spend 10 nights at hotels within the Hilton Worldwide portfolio.
Offer is for named recipient only and is not transferable. Offer valid for nights completed between now and December 31, 2010 at hotels within the Hilton Worldwide portfolio. You must check-in and check-out during the promotion period. Prior to check-in of your first night, Hilton HHonors members must first register for the promotion through a link provided exclusively within the offer email. There is no limit to the number of Free Night Certificates you may earn through this promotion. The more nights you stay, the more free nights you earn. The ten nights need not be consecutive. The free night certificate will be delivered within six weeks of completion of every 10 paid nights. The free night certificate is valid for one year after date of issuance at all participating hotels within the Hilton Worldwide portfolio. The free night certificate applies to one night's standard room rate and corresponding taxes and does not apply to gratuities, resort fees or incidental charges. Redemption of certificate is subject to availability. Offer may not be combined with other select offers.