GAME GENIE CODES: Quad Challenge.
 No.  Code  Effect
   1  ML3T-FYVJ  Set time to 90 for Atlanta and New York instead
 of 75 and 80
   2  JG3T-ECVJ  Set time to 65 for Atlanta and New York
   3  M83T-F8VL  Set time to 95 for Santa Fe and Miami instead of 80 and 75
   4  J43T-ENVL  Set time to 70 for Santa Fe and Miami
   5  M83T-F8VN  Set time to 95 for Grand Canyon and Denver instead
 of 80 and 85  
   6  J43T-ENVN  Set time to 70 for Grand Canyon and Denver
   7  M83T-F8VR  Set time to 95 for Detroit and Death Valley instead
 of 70 and 85
   8  J43T-ENVR  Set time to 70 for Detroit and Death Valley
   9  L03T-FYVT  Set time for Honolulu to 90 instead of 75
 10  L03T-ECVT  Set time for Honolulu to 65
 11  A5NT-AA9E  Infinite time--player 1
 12  A5PA-AA4W  Infinite time--player 2
 13  HT9A-DARJ + M69A-CAGL    Set time to 95 for all tracks
 14  HT9A-DARJ + JE9A-CAGL  Set time to 65 for all tracks

Codes 15 and 16 are powerful, but must be used carefully.
Do not continue to accelerate after you have reached the maximum speed of 199 km/hr,
or your engine will overheat and your speed will immediately drop to zero.
 15  HT7T-BEJL + NA7T-ACAN  Accelerate faster--player #1
 16  HT7T-BESG + NA7T-ACHJ  Accelerate faster--player #2

Download The Big Book of Game Genie Codes.