Below I will include a list of what to do in order to unlock all of the cars in the game. This is not an official list and this is just my best reasoning as to what you need to do to unlock them. If you know of what to do to unlock these cars and want me to correct it please let me know.
Timestamps for unlocking all cars from right to left of the Roll Cage (with explanations of what to do).
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Commando: Land Backwards 1:08-1:17
Sting Rod: Do a Barrel Roll 3:01-3:11
Flamer: Perform All 3 Tricks at Once 4:59-5:10
Enforcer: Perform 2 or More Rotations of All 3 Tricks and Land Multiple Times 10:26-11:25 (This is the hardest one to unlock in my opinion)
Shocker: Perform 3 or More Rotations of All 3 Tricks 7:15-7:29
Tall Ryder: Perform 3 or More Spinning Barrel Rolls 12:36-12:45
Surf Crate: Land a Barrel Roll on Two Wheels Backwards 22:00-22:16
Stepper: Land a Barrel Roll on Two Wheels 9:57-10:02
Boonyn: Perform 4 or more Spinning Barrel Rolls and Land Backwards 27:02-27:26
Radar: Complete the Tournament 21:09-21:54
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Hot Wheels Stunt Track Driver 2 is a PC game that was developed by Mattel Media and published by THQ on October 4, 2000. In this game, the player chooses and drives actual model Hot Wheel cars on various outdoor tracks. While racing on the tracks, the player can attempt to do various stunts and earn a speed boost by doing them. The 3 tricks that can be performed in the game are: Barrel roll (hit the ctrl button), turning sideways (using the left and right arrow keys), and front/back flipping (using the up and down arrow keys). A combination of these tricks can be performed together to earn more speed boosts.
There are 3 different modes to play in the game: A time trial (free race) mode, tournament mode, and level editor mode. In the time trial mode, the player can race on the various unlocked tracks and can try to beat the previous time records, or can drive for fun. In Tournament mode the player races on all available courses of the game in order and must beat them in a given time limit. In level editor mode the player can create and race on their own levels by placing various obstacles and paths into an open field.
The player starts out with 3 Hot Wheels cars and can collect others by playing through the game and doing various tricks or by beating the tournament.
All rights go to Mattel.