Mink Gold

In Mink Gold, you collect golden balls in a maze while avoiding ghosts. You don't need to collect all golden balls, just enough to make a green key in the maze magically turn into a red key. You have to pick up this red key and exit via the door before the timer on the right side of the screen (lifted from North & South) runs out. Because you get only one life, beating all 16 levels is difficult.