An eroge and bishoujo game series by [[Sogna]].

h4. Titles

* [[Viper V6]]
* [[Viper V8]]
* [[Viper V10]]
* [[Viper GTS]]
* [[Viper V12]]
* [[Viper V16]]
* [[Viper BTR]]
* [[Viper CTR]]
* [[Viper F40]]
* [[Viper M1]]
* [[Viper Island]] Vol.1-6
* [[Viper F50]]
* [[Viper GTB]]
* [[Viper Paradice]]/[[Viper Langerie Black]], [[Viper Purple]] and [[Viper Red]]
* [[Viper GT1]]
* [[Typing Viper]][[Viper Typing]]
* [[Viper M5]]
* [[Viper RSR]]
* [[Viper M3]]
* [[Viper V6R]]
* [[Viper V8R]]

[[Viper GTS]] was made into a three part hentai anime series in 2002 by [[Studio G-1 Neo]].

h4. Other titles from Sogna
* Galactic Guardian Guynarock R
* Animahjong
viper (series)