Social games maker Zynga on Thursday launched a new version of "Words With Friends".
The updated application has several new features including solo play offline and a dictionary for learning words, Zynga said in a statement.
The game has become the top free game of all time at Apple's online App Store, Zynga said, and the title is billed as the world's most popular mobile word puzzle, with some 55 million matches happening at any time.
Zynga is trying to expand to games tailored users will be able to play on mobile devices.
The San Francisco company recently announced a new line of sports games under the brand "Zynga Sports 365." It it signed a licensing deal with the National Football League and NFL Players Inc. to use real NFL teams and athletes, as well as a multi-year partnership with Tiger Woods for golf-themed games expected to debut on mobile devices in 2015.
Zynga has also announced a deal with Warner Bros. Interactive Entertainment to license the Looney Tunes brand for mobile games, expected to be launched later this year.