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CenturyLink Field is arguably the toughest place for an opponent to visit in the NFL, and the Seattle Seahawks are doing their best to keep it that way for the NFC Championship Game.

According to the team's official website, the Seahawks are limiting ticket sales to certain states. Tickets will only be sold to fans with the following states in their billing address: Washington, Oregon, Montana, Idaho, Alaska, Hawaii and the Canadian provinces of British Columbia and Alberta.

UPDATE: Monday, January 13, 11:30 a.m. ET

It looks like the Denver Broncos will also be limiting ticket sales to certain states for their AFC Championship Game vs. the New England Patriots, according to Stuart Zaas of DenverBroncos.com:

"Tickets will be available only to those with a valid billing address in the Rocky Mountain region, including Colorado, New Mexico, Utah, Wyoming, Nebraska, Montana, South Dakota and Western Kansas."

NFL SVP of Communications Greg Aiello says teams are free to do what they want with their tickets:

“Those are individual team business decisions. There is no NFL policy that addresses it.”

--End of Update--

That's right, San Francisco 49ers fans. You are out of luck—at least right away. Tickets will likely end up being available on secondary markets, but they may not be at face value.

Seattle's plan was announced before it knew which team it was playing in next Sunday's NFC Championship Game, and now, the plan looks brilliant. Home-field advantage could be the difference between going to the Super Bowl and going home, so Seattle wants to make sure that it has as many Seahawks fans as possible in the stadium.

"The 12th man" is getting ready to cheer on the Seahawks against the rival 49ers, and San Francisco fans will have a hard time getting a hold of tickets for the huge showdown.

Hat tip to the San Jose Mercury News for the find.