BBall
BBall, is a competitive format in Team Fortress 2, it is played usually with teams of 2 players, the only class allowed being soldier. It is a gameplay modification for the game played on maps that have been purposely created or altered for the game mode. The mod focuses on allowing individuals to practice their rocket jumping and air shooting skills.
It is considered a great source of movement and aim practice, as such, it is often highly regarded amongst high level players.
Maps
The gamemode is possible due to custom maps made by the community. The more popular ones are ctf_ballin and ctf_bball, the maps work like a CTF map would, the only difference is that the Intelligence simulates the ball and the hoops on each side of the field represent where the player can score "a cap".
Tournaments
As this format is very straight forward and composed of teams of 2 players only, cups and tournaments are very often organized, mainly on offseason as practise for the 6v6 seasons.