Code Name: Viper is an action platformer game for the Nintendo Entertainment System.

Originally released in Japan as Ningen Heiki: Dead Fox, the game consists of destroying the drug syndicate located in South America. The player is called Kenny Smith or known as Mr. Smith (the game) which is sent by Commander Jones in order to rescue the civilian hostages and an agent who has information about the author who smuggles the drugs and also It gives you a bomb to go to the next level. You must go through the 7 hiding places of the great drug traffic. As you save the wounded agents, it will give you clues about the real author and kill him.

Some character graphics conversion from Rolling Thunder.
"Dead Fox" is an action game released by CAPCOM in 1990.
Converted it as it is, but some patterns were changed. (some have been redrawn)
Modification of some rescued persons.

Database match: Dead Fox (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: DF1D1AA408E939D11EA24D03386377F1219EB611
File CRC32: F316B497
ROM SHA-1: 572F719D09C6538477AF240C81950D43B133C480
ROM CRC32: 2E1E7FD8