A day before the World Cup opener, tickets remain available for more than 15 matches, including some involving Germany, Italy and France.
FIFA said it already sold more than 2.9 million tickets, but some were still on sale Wednesday.
There were plenty of tickets for matches between less prominent nations, including Bosnia-Iran and Greece-Ivory Coast, but it was also still possible to watch some of the more traditional teams.
Fans can still get tickets on FIFA's website for matches such as Germany-Ghana, Switzerland-France and Italy-Uruguay.
Only tickets for the highest-priced categories remained available for the better matches.
FIFA said a total of about 3.1 million tickets will be sold for the first World Cup in Brazil since 1950.
Brazil plays Croatia in Sao Paulo on Thursday in the opening game.