Code Name: Viper

SZOVKNVK Infinite lives
PENTAGLA Start with 1 life
TENTAGLA Start with 6 lives
PENTAGLE Start with 9 lives
GTETLIZL Start with double usual bullets
PPETLIZU Start with half usual bullets
GTOVEYZL Double usual bullets on new life
PPOVEYZU Half bullets on new life
VVNVGKSE Start with machine gun and 256 bullets
VTOTONSE Machine gun and 256 bullets on new life
AAOXLZPA Infinite machine gun bullets
AENXZPPA Infinite bullets for your gun
SXKEVNOU + ONEOYEXN Upper level jump
GZOTONSE + GZEVVNSE Keep machine gun after dying
STVPVOON + AASOVZPA Infinite energy