In Grand Theft Auto V, the car based on the Bugatti Veyron is called the Adder.
The Adder is a fictional supercar manufactured by Truffade, a brand in GTA V modeled largely on Bugatti. Its low, wide body, rounded roofline, central grille, and distinctive rear design echo the Bugatti Veyron, especially the high-performance Veyron Super Sport. Like its real-world inspiration, the Adder is presented as an expensive, elite performance car.
Players can purchase the Adder through Legendary Motorsport for $1,000,000, and it can also appear parked on Portola Drive in Rockford Hills. Its impressive straight-line speed makes it desirable, although its handling and cornering are less exceptional than its looks suggest.
A common mix-up is choosing the Cheetah or Entity XF, which are also high-end supercars in GTA V but are based on different real vehicles. The Zentorno is another fast supercar, introduced as a separate fictional model rather than the Veyron counterpart.