Millipede is the successor to Centipede.
In contrast with Centipede, the field of mushrooms moves up and down. This prevents a common tactic in Centipede, where the player arranges the mushrooms to direct the centipede in a specific path.
There are all the enemies present in Centipede, and several new ones. There is a worm, which slows down all enemies temporarily when shot. There is a ???, which turns mushrooms into indestructible flowers. The ??? is like the flea, but it moves from side-to-side down the screen as it adds mushrooms. The ??? removes mushrooms, and moves the entire mushroom field up one row if hit. Mutliple spiders can be present simultaneously. There are DDT bombs which take out an area.