NFL Street is American football video game. Similar to the Blitz series, Street is seven-on-seven American football, modeled roughly after its informal variant, street football. NFL Players in the game wear street clothing instead of helmets and uniforms (although the players can wear football jerseys). Like other American Football games, NFL Street has basic football rules, but no fouls and low penalty gameplay, naturally leading to much more intense gameplay than its real-life model. However, to maintain the "IronMan" status, there are no injuries in the game.
One important feature in the game is "style points", which the player can earn by successfully completing style moves (which includes making a huge play or taunting the other team during the game). Enough style points will earn the player a ‘'Gamebreaker’’, which lasts for the entire drive. The Gamebreaker concept was taken from NBA Street.
Quick Game — In this mode you select a team and play a quick game against either the computer or a friend. The scoring system can be in touchdowns or style points, depending on the choice of the player.
Pickup Game — A Pickup Game is the same as a Quick Game, but instead of choosing a team, you and your opponent create teams from a pool of around 40 NFL players, some of which are Legends. In game, the teams are referred as "Team One" and "Team Two".
NFL Challenge — This is the main mode in the game. You create a team, from logo to players height, and go through a series of challenges against other teams, unlocking new football stadiums, teams, equipment, and development points for improving your team;by completing several chalanges that vary in their difficulty
All NFL Pickup — To unlock this mode, you must first beat the NFL Challenge mode. The same features apply as in Pickup Game, but instead of a 40 player pool, you can select from any of the players in the game, including Legends.
Source: Wikipedia, "NFL Street", available under the CC-BY-SA License.