Max uses the high-score handle MADMAX on the arcade game Dig Dug in Stranger Things season 2. The name appears on the Palace Arcade’s leaderboard before the boys realize that the mysterious top player is the new girl in Hawkins.
Maxine “Max” Mayfield moves to Hawkins in 1984 with her mother, stepfather, and stepbrother Billy Hargrove. She quickly establishes herself as an accomplished arcade player, using the name MADMAX to beat Dustin’s score on Dig Dug. Dustin and Lucas become fascinated by the unknown player before discovering that Max is responsible.
The handle reflects Max’s confident, rebellious personality and her interest in arcade games. It also helps introduce her as someone who can match the boys at an activity they treat as their own territory. Max later joins the main friend group and becomes especially close to Lucas.
MADMAX is easy to confuse with Maxine, her full first name, or Zoomer, a nickname associated with her. The question asks for the arcade leaderboard name, so the exact answer is MADMAX, written in capital letters in the show.