This video shows every race offered in Need for Speed: Carbon's side campaign called the Challenge Series. Having a difficult time beating this mode? Perhaps this can help. Expand the description if you want to check out a certain event.

Canyon Duel
[0:03] Bronze Canyon Duel Lexus IS300
[1:05] Silver Canyon Duel Plymouth Road Runner
[1:44] Gold Canyon Duel Chevrolet Corvette Z06

Canyon Races
[3:41] Bronze Canyon Race Mazda RX8
[6:16] Silver Canyon Race Mitsubishi Eclipse GT
[8:26] Gold Canyon Race Nissan 350Z

Checkpoint
[10:56] Bronze Checkpoint Race Renault Clio V6
[14:22] Silver Checkpoint Race Plymouth Hemi Cuda
[17:22] Gold Checkpoint Race Porsche 911 GT3 RS

Canyon Checkpoint
[20:53] Bronze Canyon Checkpoint Race Chevrolet Camaro SS
[23:27] Silver Canyon Checkpoint Race Mazda RX7
[25:10] Gold Canyon Checkpoint Race BMW M3 GTR

Canyon Drift
[27:24] Bronze Canyon Drift Aston Martin DB9
[29:50] Silver Canyon Drift Toyota MR2
[31:49] Gold Canyon Drift Lamborghini Murciélago LP 640

Pursuit Evasion
[33:43] Bronze Pursuit Evasion Mazda Mazdaspeed3
[36:50] Silver Pursuit Evasion Dump Truck
[43:54] Gold Pursuit Evasion Nissan Skyline GTR R34

Trade Paint
[59:57] Bronze Trade Paint Dodge Charger SRT8
[1:06:19] Silver Trade Paint Subaru Impreza WRX STI
[1:09:13] Gold Trade Paint Chevrolet Chevelle SS

Circuit
[1:22:17] Bronze Circuit Race Alfa Romeo Brera
[1:26:32] Silver Circuit Race Lamborghini Gallardo Coupé
[1:30:38] Gold Circuit Race Shelby GT500

Sprint
[1:34:35] Bronze Sprint Race Dodge Charger R/T
[1:37:13] Silver Sprint Race Porsche Cayman S
[1:40:31] Gold Sprint Race Mitsubishi Lancer Evolution IX

Drift
[1:42:42] Bronze Drift Lotus Europa S
[1:45:01] Silver Drift Toyota Supra
[1:47:02] Gold Drift Chevrolet Corvette Z06

Speedtrap
[1:49:58] Bronze Speedtrap Chrysler 300C HEMI SRT8
[1:53:10] Silver Speedtrap Ford Mustang GT
[1:55:49] Gold Speedtrap MercedesBenz SLR McLaren

Race Wars
[1:58:10] Bronze Race Wars 1999 Mitsubishi Eclipse
[2:04:23] Silver Race Wars MercedesBenz SL65 AMG
[2:16:38] Gold Race Wars Dodge Challenger Concept

Collector's Edition Challenges

Checkpoint
[2:23:09] Bronze Checkpoint Race Angie's Dodge Challenger Concept
[2:25:18] Silver Checkpoint Race Wolf's Lamborghini Murciélago Coupé
[2:28:32] Gold Checkpoint Race Kenji's Mitsubishi Lancer Evolution IX

Pursuits
[2:40:21] Bronze Disable 25 Cops Shelby GT500
[2:55:01] Silver 5 Minute Evasion Jaguar XK
[3:05:30] Gold Disable Rhino SUV Dodge Viper SRT10

Race Wars
[3:16:38] Bronze Race Wars Nissan 240SX
[3:25:27] Silver Race Wars Chevrolet Camaro Concept
[3:31:21] Gold Race Wars Koenigsegg CCX