Normal mode Classic Home Invasion has multiple gamemodes, the default mode is a story which has multiple endings, in the story you play as an ordinary guy named Billy who isnt very interesting until he gets kidnapped by an Alien cannibal monster. In this mode you will need to make your way through the monsters lair and choose your own path from there. Virus Survival/Endless mode This gamemode is an endless gamemode which once again has you play as Billy, once again survivng against aliens but this time it is several aliens instead of one- the alien has become a growing virus which is attempting to rebuild itself back into its normal form. This mode has you survive for time counted in days (not actual real days) and every once in a while a new monster will be introduced, but to survive this there is an ingame shop to help you which you can use to spend money (not real money) earnt from surviving days. Home Invader mode This mode is a sandbox style mode which will place you in the shoes of the alien invader himself.