When trying to achieve all gold medals in championship mode, if you fail to win one of the races, reset the GameCube before it auto-saves. You can then choose to continue the championship and restart at the race you failed to win, without having to replay (and win) all the previous races. Additionally, when competing in multi-race championships, it is often frustrating when you get a gold in the first race but fail the next. To avoid this, choose to return to the main menu after a successful race. Go to the options, select "Save/Load", and save to a backup profile slot. Reload your original profile. Attempt the race, and if you succeed, again save to a backup profile and load your original profile again. If you fail, load the backup profile.
Easy boost
You can get a boost easier by doing drifts. However press B, drift, then keep tapping B for a better chance of not crashing. Also, drive on the wrong side of the road to receive a boost faster. If your opponent is in the wrong lane, follow him, but not to closely. This allows him to pass the traffic for you. Also, if he hits someone you can get out of he way if you are not too close. This is unlikely however, as the CPU follows the cars through a safer route. As long as you do not disturb him he will not hit anything. This will give you a faster and safer boost. Additionally, when you get a full boost meter, you can gain and use boost a lot faster by tapping A (Boost) button instead of holding it down and draining your boost all the way.
Easy gold medals in crash mode
Learn which car to crash into first, then restart, do a boost start, then burn into it.
Easy money in crash mode
When you are about to hit the car you think will make the biggest crash, use the turbo and drive towards that car. Hit your brakes and do a power slide into the car. This should put you into the air. Note: This will not work on trucks. Also for easy money in Crash Course 6, select a car that catches air easily (such as the SUV). Start with a boost and burn out of the tunnel. Go all the way to the left and hit that car.
Easy points
If you are on a course that has a lot of bumps, do not drive the trucks, 1970's car, stock car, hotrod, or gangster. The best car for this are the Japanese muscle or the student driver car.
Easy pursuit wins
Try to get as close to the vehicle as you can when you have turbo. Then, use it and get in front of the car. Stay in front of it. It will try to get past you. When this happens, keep hitting it as it tries to pass. In the pursuit modes, you can win the race immediately if you force the other car into a head-on collision with traffic -- this will stop them quite nicely.
Easy turbo
Drive on the wrong side of the road until your turbo (NOS) tank or bar is full.
Face off mode
Finish all races in championship mode with gold medals.
Freerun
Successfully complete the Custom Series Championship to unlock the "Freerun" option at the "Cheat Mode" menu.
Get "I Can't Drive 55" song from Sammy Hagar
Get three Burnouts in one lap.
Get 2 Player Pursuit Mode
Beat Pursuit #3.
Get All Cars & tracks (Requires Original Burnout Game)
Use a saved game from the first Burnout game that has Free Mode unlocked. To use the save game just select it at the load screen.
Get Cheat Mode Option
After unlocking any cheat you will get the Cheat Mode option on the options screen.
Get Classic car
Finish Pursuit 2.
Get Driver's Ed Car
Finish driving 101 and get all gold medals.
Get Gangster car
Finish Pursuit 3.
Get Hot Rod car
Finish Face Off #1.
Get Hot Rod car
Finish Face Off 1.
Get Police car
Finish Pursuit 1.
Get Runaway Cheat
Finish all the Crash Mode with Gold Medals to unlock the Runaway Option in the Cheat Menu. This option is like Crash mode with no brakes or goals. R1 will give you a boost if pressed at the start.
Get Stock car
Finish Face Off #2.
Invincibility Cheat
Finish all the Grand Prix Championships with Gold medals to unlock the Invulnerability option in the cheat menu.
Powerful boosts in crash zones
This trick works in one player and two player modes. When you are doing the crash zones, at the start immediately hold R for a boost. After a few seconds, press it again. This should give you more boost, which results in a faster speed and better crashes. Repeat this as many times as desired. Additionally, when you are doing Crash Zone 7 "Whip Up A Storm Of Metal And Glass", go to the right onto the dirt. You can have a wider angle to turn left at the intersection, and therefore have more speed for a greater crash.
Speed boost at start
At the start of the race just after it shows 3-2-1. on the 1 do the tyre burn (press square then x)and you will get a huge speed boost at the start of the race.