Outrun.

 No.  Code  Effect
  1  RYBT-A6ZJ  MASTER CODE--MUST BE ENTERED
  2  RY4T-A6ZJ  Infinite time to complete race
  3  BE2A-AWAY    Start with 99 seconds--hard and normal levels
  4  AA2A-ANAY  Start with 60 seconds--hard and normal levels
  5  BE2A-AWAJ  Start with 99 seconds--pro and super levels
  6  AA2A-ANAJ  Start with 60 seconds--pro and super levels
  7  BE2A-AWAR  Start with 99 seconds--easy and super easy levels  
  8  AA2A-ANAR  Start with 60 seconds--easy and super easy levels