Arachne is the second boss in Pac-Man Party. He is a large purple spider that wears a skull helmet. Arachne was imprisoned beneath the pyramid in Mirage Oasis 1,000 years before the events of Pac-Man Party, and serves as the boss of the Mirage Oasis board.
1,000 years before the events of Pac-Man Party, Arachne was sealed beneath the pyramid in Mirage Oasis.
Arachne appears in Pac-Man party, sealed beneath the large pyramid in the background of Mirage Oasis. As the players pass by the excavation site on the board, they will dig a hole deeper until they hit water. Once the player digs deep enough, water surrounds the pyramid, releasing Arachne. Arachne draws closer to the board each turn, eventually reaching the board, causing the players to begin a battle against him.
- Arachne is named after the weaver Arachne from Greek mythology. In the myth, she was turned into a spider by the goddess Athena. Despite the Arachne in the myth being a female, Arachne in Pac-Man Party is stated to be male.
- In the Rewards section of Pac-Man Party, Arachne is stated to be Idmon's son.