2: VBBCWBBBCX9
3: LBBBHBBBCX9
4: 4BBCRBBBCX+
5: GHBFLBBBCX9
6: ZYBBHBCDFX7
7: QHBBNBCGYX5
8: 8DVDBBCGYX7
9: DBBDZBCGYX+
10: XZBFWBCGYX4
11: N+BDMBC4YX7

Unlock Dirt Tracks
To unlock dirt tracks, go to the password screen and enter this code: 6YBBQBBBCBF. The dirt tracks will now be available in Practice Mode.