Found this link at the Patriots website
To enter to win two (2) tickets to the Patriots 2015 home opener at Gillette Stadium, enter your guess and submit your contact information below.
* 1. Who will the Patriots play in their 2015 home opener?
https://www.patriots.com/fan-zone/sweepstakes/2015/2015-patriots-…
If you get the home game correct you get 2 ticket for free.