Year Name Developer Machines
1993 Viper-V6 Turbo '
Not Classified, | ???, 		ソニア (Sogna) x68000
1994 Viper-V8 Twin Turbo '
Visual Novel * Mature *, | 1P, 		Sogna x68000
1995 Viper-V12 '
Not Classified, | ???, 		ソニア (Sogna) pc9821
1995? Viper -V16- Imagine '
Not Classified, | ???, 		ソニア (Sogna) ibm5170 pc9821
1997 Viper F40 '
Not Classified, | ???, 		ソニア (Sogna) pc9821
1997 Viper CTR - Asuka '
Not Classified, | ???, 		ソニア (Sogna) pc9821