kill al mental patients is much earlier in the game, the last 3 levels have aliens, first only in the pyramids and in the last level you have to kill them all and destroy their vessel <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Aaah... I might have gotten to the end of that game if the bloody thing would run under Windows XP. <img src="/ubbthreads/images/graemlins/memad.gif" alt="" />
Is their vessel a special vehicle or destructable scenery?