Race bonuses

Win the following races to unlock the corresponding car or part.
Saleen Qualification: Hummer H2
Colossus: Nissan 350Z
Urban Sports Cars: Audi TT
Nissan competition: none
V6 Engine: Sport Tuning Kit Evo 1
Urban Performance Cars: 2005 Corvette C6
Low Displacement Challenge: none
Chapman tribute: none
Chevrolet Fighting: Sport Tuning Kit Evo 2
Aero 8 Trophy: none
Mythical Elanor: Morgan Aero 8
Barchetta Challenge: none
Under 500 hp: Performance Tuning Kit Evo 1
GT Championship: Nissan Skyline GT-R R34
Aston Challenge: none
German Power: none
TVR Challange: none
Gentlemen Drivers: Performance Tuning Kit Evo 2
Sport Racing Cars: Lamborghini Gallardo
V8 Fever: Unknown
V10 Rage: Evo Kit 1
Propulsion Challenge: Unknown
Performance Racing Cars: Unknown
V12 Only: Unknown
American Muscles: Unknown
4×4 Competition: Unknown
Carol Shelby Challenge: Unknown
Ultra Race Cars: Lamborghini Murcielago
Professional Challenge: Unknown
Italian Affair: Unknown
Gamelati 1000 SS motorcycle

Win all the Road Challenges in arcade mode.
Gameloft F1

Win all Evolution Championships in first place.
Easy boost-energy

By driving up close on civilian cars you build up the boost meter. Instead of trying to approach them without direct contact (which can be hard to perform) simply crash into a car that comes your way (it must not go in the same direction as you do). By doing so you will only lose about 40 km/h of speed but gain an additional full turbo boost.
Quick refill of the boost meter

On the roadside are various objects like phone booths, hot dog booths, plants, street signs, boxes, etc you can drive through. Doing this gives your turbo meter a nice boost.

Cheat List
First enter the code for the cheat screen at the main menu. Cheat Screen: 24328 All weapons: 48662 Infinite clips: 48627 Infinite ghost vision: 46266 Unlock all single player maps: 67687

Big Show

Complete Royal Rumble

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Unlock Moon Zone

Beat the game with all 7 Chaos emeralds and play Sonics X-Zone. After you defeat him, you will unlock the moon zone.
Fly high:

Play as Sonic (recommended), Miles, or Knuckles. Go to Zone 1 Act 1 and go to the area where the first loop is located. Stand on the sliver of land, then charge a Spin Dash for twenty seconds. Dash to the right and hold Down/Right. You will go down the hill (not getting all the rings). Eventually, you will go so fast that you will leave the screen. Sometimes it does not launch you off the cliff at the end.

Unlockable: Moon Zone
Beat the game with 7 Chaos emeralds and beat Sonics X-Zone to unlock the moon zone.

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Cheat: Cheat Menu
Enter this code: 3666, To enter the cheats menu.

Online Mode

By defeating the boss kingdom on the third map, you will be rewarded with the Online Crest and be able to play the game online via N-Gage Arena.

Unlimited lives:

Pause game play, then Select “Settings” and choose to host a multi-player game. The “Waiting for players” screen will appear, then disappear. You can now continue your game. If you die, simply select “OK” to continue.

Level Select

Beat the singleplayer game and use the complete save to have access to the level select.
Difficulty Select

Beat the singleplayer game and start a new game. You will now have a new option to select difficulty.

Alternative ending

Beat the game on hard
Level Select – Easy

Complete the game on easy difficulty

Level Select – Normal

Complete the game on normal difficulty
Level Select – Hard

Complete the game on hard difficulty
Gallery

Complete the game on easy, normal and hard difficulty