Here are some cheats and tips for the game Galaga Demons of Death.
XVOKVUXK Infinite lives
PAKKKILA Start with 1 life
TAKKKILA Start with 6 lives
GXEVPAEI Start with twin shots
ATNVSAVZ Become invincible
GXOKOTEI Play challenge stages only
OXSTZPSX + YESTLOPY Can’t be caught by tractor beam!
KPNIPZEA + GANIZZIA + AAVSIZPA Press Start for next wave
GGVSGXOX + EZVSIZPE + UGVSTZSE Press Start for extra life