CSR Racing is a drag racing game available on the App Store and on Android. The cars available are split into tiers and you must beat crews to unlock new tiers. The in-game currencies consist of two parts: dollars and gold. Dollars are relatively easy to obtain, by winning races and through special one-time deals where if you buy a certain vehicle the manufacturer supplies you with dollars for upgrades. Gold, however, is harder to earn and can only be obtained through leveling up, defeating bosses, some daily battles and from cards from multiplayer.