Upon unlocking a car, the player can choose from a few official stock colors. Each car can also be customized with the new car editor feature. For each new star, the car's performance capability is increased (at the cost of a lesser fuel tank quantity). All cars in the game now require 'blueprints' to unlock and then subsequently 'star up', with each of them having anywhere from 3 to 6 stars. The player starts with a car in the lowest class (Class D), the Mitsubishi Lancer Evolution X. Like its predecessor, each of the cars belongs to a class progressively featuring higher performance and rarity: D, C, B, A, and S. There are currently 142 cars as of the September 2021 update.

There were 48 cars featured in the game when soft-launched, but the worldwide release saw the introduction of four new cars, leading to 52 cars. The gameplay in Asphalt 9 is similar to the other Asphalt Games with noticeable differences in graphics and design. Pictured is a gameplay still featuring the TouchDrive control scheme. Asphalt 9 makes extensive use of simulated HDR rendering and pixel shaders, as seen on the sky and specular reflections on the road surface.

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