Farm road 29 shortcut

 After you have started farm road 29, and go past the 3rd checkpoint, you
 immediately will make a hard left onto the railroad tracks. Then you can
 go the length of the tracks by driving on the left side of the tracks or
 driving on the tracks until you see the 4th checkpoint on your left.You
 must drive on the left side of the tracks when a train is coming because
 you will get stuck on the opposite side of the 4th checkpoint if you
 don't. If you do this correctly, you can shave as much as seven seconds
 off your lap time.

 Ice Hockey

 The "Underwater Hockey" described on Breakneck Ridge can be played if the
 weather is set to snow. The puck appears on top of the ice and the "goals"
 can be used.

 Secret Passage

 First set up your truck and then go to the Excavation. Next when you
 started the race switch your map on and then go to the loop right before
 you jump to the straightaway. When you are there you will see a temple, go
 around the temple until you see the brightest side. when you find it you
 will see a opening, go in side of it but before you do go to the right or
 the left to get in, you can't go stright. To get out push "H" to activate
 the helicopter.

 Torture Pit Track

 While Racing on Sidewinder Canyon race to the 4th checkpoint. Go past the
 bridge and make a quick right going through the barricades to the right.
 Follow the dirt path and stop after the first bridge and make a right
 onto another bridge. Follow that bridge to the end and you will see a
 checkpoint that will say "pit". Go through the checkpoint and follow the
 on-screen instructions and you'll get the track.

 Underwater Hockey Rink

 In Breakneck Ridge you should see a pool of water with two arches standing
 above the water. If you go under water, you will see a hockey puck. Those
 two arches you saw above the water are nets.

 Taken from our partner site http://btwracing.com

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 Go to the subdirectory \system in your game directory and double
 click the file MONSTER.INI. Now change the value behind
 showHiddenTrack to 666 and a secret level should be revealed.