When Wilddog first appears to fight, shoot the man with the rocket launcher to the left of him. Next, shoot the other man on the right. Then, shoot the blue man under Wilddog. Finally, shoot Wilddog six or more times. If you succeed, you will fight many yellow men when fighting Wilddog immediately before Area 1 ends.
Game Shark Codes
Master Code (Must Be On) EC8786C8 142BEB0C
Infinite Credits 4CDFA738 1456E79E
Infinite Health P1 4CF3BA80 1456E7A1
Infinite Health P2 4CF3BAE0 1456E7A1
Infinite Ammo Gun 1 4CF3BDE4 1456E79E
Infinite Ammo Gun 2 4CF3BD14 1456E79E
Infinite Time 4CF3BA84 14560126