Tutorial! is a mission in Grand Theft Auto 2 given to protagonist Claude Speed by an unknown person on the telephone. As its name suggests, the mission exists to introduce the player to the game's gang mechanics.
As soon as the player starts the game, in an aptly named block called "Trainingmission", there will be a payphone in front of the player that can be used to trigger this mission. In it, a man (possibly the owner of the nearby Jesus Saves) instructs Claude to visit the payphones of the Zaibatsu, the Loonies, and the Yakuza to show him how the respect system works. After visiting them, he tells Claude to come back to the mission's starting place.
If the player heads back to Trainingmission as told by the man on the telephone after visiting all gang payphones, they will receive an S-Uzi Machine Gun and a token.