entertainment media and software can be downloaded, including games and nowadays majority of games are distributed through them. The popularity of mobile games has increased in the 2000s, as over US$3 billion worth of games were sold in 2007 internationally, and projected annual growth of over 40%. Ownership of a smartphone alone increases the likelihood that a consumer will play mobile games. Over 90% of smartphone users play a mobile game at least once a week. Many mobile games are distributed free to the end user, but carry paid advertising: examples are Flappy Bird and Doodle Jump. The latter follows the "freemium" model, in which the base game is free but additional items for the game can be purchased separately. See also iPod game Handheld electronic game Handheld game console Handheld video game List of highest-grossing mobile games List of most-played mobile games by player count List of most-played video games by player count Mobile software Mobile gambling Mobile development Screen protector N-Gage (device) Scalable Network Application Package Transreality gaming References Game Video game platforms Video game terminology