Jammer Pac-Man (ジャマーパックマン Jamā Pakkuman) are creatures that appear in Pac-Man 99 and double as both allies and enemies to the player. When Pac-Man eats a ghost, it sends a Jammer Pac-Man to each targeted player, who will then spawn in the game shortly after and chase Pac-Man.
Jammer Pac-Man come in two varieties, white and red. White Jammer Pac-Man pursue Pac-Man and are killed on contact, but greatly slow down Pac-Man if he is moving. Eating a Power Pellet instantly wipes every Jammer Pac-Man from the maze, both active and spawning. Red Jammer Pac-Man (known by the fans as Slammers) appear much later in the match, are slower, and instantly kill the player if touched. Power Pellets freeze Red Jammer Pac-Man in place (remaining lethal on contact when frozen), while fruits remove them completely.