Note: Bonus Cars can only be unlocked in Arcade mode!
Use a memory card with a Smuggler's Run saved game on it to unlock the Dune Buggy. A message will confirm correct code entry.
Complete Manhattan level 10 in Head-2-Head mode.
Complete London level 10 in Head-2-Head mode.
Complete Manhattan levels 1, 4, and 7 in Head-2-Head mode.
Complete Manhattan levels 2, 5, and 8 in Head-2-Head mode.
Complete Manhattan levels 3, 6, and 9 in Head-2-Head mode.
Win the 1st, 4th, and 7th Head-2-Head races.
Win the 3rd, 6th, and 9th Head-2-Head races.
Win the 2nd, 5th, and 8th Head-2-Head races.
Win the 12th, 13th, and 14th waypoint races in London in arcade mode.
Win the 12th, 13th, and 14th waypoint races in New York in arcade mode.
Beat the game 5 times. The fire truck win't have a water hose. Instead it has a flame thrower!
Bonus cars are unlocked via red circles that appear on different levels. When you find a red circle, place your car in the circle until you hear a gurgling sound to indicate that you've unlocked a bonus car.
Current known red circle locations:
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London
1) At the starting point, look for a ramp on one of the nearby buildings. Go up the ramp to find a red circle on the roof of that building. Near the starting point is a ramp on one of the buildings. This leads to the circle on a roof.
2) In the center of the map, you will find the Parliament building. You can tell it's the parliament building by the pillars on the outside. Drive through the window to find the circle inside.
3) Once again in the center of the map, locate a unique looking turn near the Parliament building. You will see a ramp, which you should climb. Next, jump off either to the left or the right. Make sure you actually jump and do not fall instead. You should find the circle nearby.
New York
1) Find the big tunnel where there is a park nearby. You should find a circle on a building roof near the park. You will have to jump to reach the roof.
2) Find the aircraft carrier and locate a building nearby. You will find the circle insde the second floor of that building, but you must jump to enter that floor.