The Chainsaw is a portable mechanized saw commonly used as a tool for cutting down trees. Due to its intimidating noise and potential for mutilation, it is frequently employed as a weapon in pop culture, horror movies, and the Grand Theft Auto series as well.
Standing still while pressing the attack button will allow the player to swipe with the chainsaw; pressing the button while moving does not allow swiping, but allows the player full mobility. The chainsaw is the only melee weapon which slows the player to a walking pace; in GTA San Andreas, the player also cannot jump with the chainsaw equipped. As such, it is unsuitable for attacking fleeing targets. In GTA Vice City, drops of blood can be seen spattered at the screen when the player successfully attacks a target (although this was removed in the game's mobile release). The Chainsaw was not featured in the HD Universe (except in Chinatown wars) because of the realism the games brings, also, because the gore was removed from the series.
Use of a chainsaw in public will cause pedestrians to panic, and, if a police officer is nearby, the player will gain a one-star Wanted level, regardless of whether the player harms anyone in the process.
The chainsaw can easily remove parts such as hoods, bumpers and even doors from vehicles, however its blows glance off vehicles' main chassis, thus causing only superficial damage.
In Grand Theft Auto: Vice City, tapping the attack button will make Tommy rev the chainsaw, and frighten nearby pedestrians. This can be done both while moving and standing. It can only be done while moving in Grand Theft Auto: San Andreas.
In Grand Theft Auto: Chinatown Wars you can hijack cars in front of police by using the chainsaw on the car. When the passengers walk out, take the car without any worry of alerting the police. However, be careful of accidentally killing the escaping passengers.