Use Dune Buggy from Smuggler's Run
Insert a memory card with a saved game from Smuggler's Run to use the Dune Buggy from that game. -From: firstname.lastname@example.org
Successfully complete Manhattan level 10 in Head-2-Head mode.
Successfully complete London level 10 in Head-2-Head mode.
Successfully complete Manhattan levels 1, 4, and 7 in Head-2-Head mode.
Successfully complete Manhattan levels 2, 5, and 8 in Head-2-Head mode.
Successfully 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.
Manhattan bonus cars
Win the 12th, 13th, and 14th waypoint races in London in arcade mode.
London bonus cars
Win the 12th, 13th, and 14th waypoint races in New York in arcade mode.
Look for red dots that appear on various levels. Place your car on the dot until a gurgling sound is heard to unlock a new car. Some of the dots can be found at the following locations:
Go near the center of the map. The dot is inside the Parliament building (block building with pillars on the outside). Drive through the window to get inside.
Find the reddish building with advertisements and an animated screen on it. Also, there is a box that almost looks like a padded cell in the middle of the street near it. Find the ramp leading up along the side of the building. Before you exit the ramp, you should be going approximately 30 to 45 mph (depending on the weight of your car). After hitting the roof immediately slam on the brakes. The dot should be to the right of you.
Find the strange turn near the Parliament building. Climb up a ramp, then jump to the left or the right, but do not fall off. Turn around to find the dot.
Once you start in London, make a 180 degree turn and head towards the blue blinking "Speed" sign. Go into the ramp at full speed. Go over on to the next roof and hit the brakes. Then, make a left turn and you will see the dot.
Go near the park above the big tunnel. The dot is on top of a roof that you need to jump to reach.
Go near the aircraft carrier. The dot is inside the second story of a building that you need to jump to enter.