Levels give every car
All four upgrades unlock by levelling, so Robux only buys time. Grade S arrives at level 20 for free.
Do Not Stop. has five cars, one per grade from D to S. You start in the Grade D car; the other four unlock at levels 4, 8, 13 and 20, or can be bought outright for 99, 199, 299 and 399 Robux. Each grade is sold as faster, grippier and quicker to stop than the one below.

Pick a car for each lane to see grade, unlock level, price and the store text together.
Choose two cars to compare.
Store text comes from the Roblox store listings. Only the starting car has community-reported ratings; no source publishes stat cards for the Grade C to S cars.
| Car | Grade | Unlock level | Robux | Starter Pack | Reported name and ratings |
|---|---|---|---|---|---|
D Starting car (Veltrano)Every Grade C to S store listing compares itself against this car, the starting car. | D | 1 | Not sold | No | Fan sheets list the Veltrano 4WD Turbo at Speed 4, Accel 4, Grip 4 and Brakes 4. |
C Hartmann 220 SportOwn the Hartmann 220 Sport, a Grade C car, for good, without waiting for level 4. Faster, grippier and quicker to stop than the starting car. | C | 4 | 99 | Included | Unknown |
B Rovelle Turbo 18Own the Rovelle Turbo 18, a Grade B car, for good, without waiting for level 8. Faster, grippier and quicker to stop than the Grade C car. | B | 8 | 199 | No | Unknown |
A Kanzaki SR-4 TwincamOwn the Kanzaki SR-4 Twincam, a Grade A car, for good, without waiting for level 13. Faster, grippier and quicker to stop than the Grade B car. | A | 13 | 299 | No | Unknown |
S Branca SR6 Gruppo BOwn the Branca SR6 Gruppo B, the Grade S car, for good, without waiting for level 20. The fastest, grippiest car in the game. | S | 20 | 399 | No | Unknown |
All four upgrades unlock by levelling, so Robux only buys time. Grade S arrives at level 20 for free.
The Hartmann 220 Sport costs 99 Robux alone. The Starter Pack is 79 Robux, one per player, and adds the First Drive skin, the First Drive Key freshener and 2,500 credits.
The store describes each grade only against the one below. Exact speed or grip numbers for Grades C to S are not published anywhere public.