Monkey Business (1986) is a classic DOS puzzle game by Learning Technologies, Inc. Inspired by the "Towers of Hanoi," players help a stack of monkeys retrieve apples by moving them one at a time, ensuring that smaller monkeys are always on top. With three skill levels and increasing complexity, the goal is to restack the monkeys under the apples in the fewest moves possible. This game was widely used in educational settings during the 1980s .