Outrunners.

 No.  Code  Effect
CODES 1 THRU 14: ARCADE MODE
   1  EMVA-AA9W  Player 1 has infinite time
   2  EMVT-AA3A  Player 2 has infinite time
   3  CWNA-BYVT  Player 1 has 90 seconds
   4  CWNA-B2KT  Player 1 has 60 seconds
   5  CWNA-BEKT  Player 1 has 50 seconds
   6  CWNA-A4KT  Player 1 has 45 seconds
CODES 7 THRU 14: IGNORE COUNTER
   7  CWNA-AGKT  Player 1 has 35 seconds
   8  CWNA-B6BT  Player 1 has 30 seconds
   9  CWNT-BYVW  Player 2 has 90 seconds
 10  CWNT-B2KW  Player 2 has 60 seconds
 11  CWNT-BEKW  Player 2 has 50 seconds
 12  CWNT-A4KW  Player 2 has 45 seconds
 13  CWNT-AGKW    Player 2 has 35 seconds
 14  CWNT-B6BW  Player 2 has 30 seconds
CODES 15 AND 16 CAUSE SLIGHT GRAPHIC ERRORS
 15  HWHA-AAA0  Select up to +60 seconds in the options screen  
 -- keep pushing right on the D-pad.
 16  2WHA-AABN  Select up to -60 seconds in the options screen
 -- keep pushing left on the D-pad.