In Xenosaga Episode I: Der Wille zur Macht, players can receive an in-game email from Namco advertising the amusingly titled "Pac-Man World 1500" in celebration of Pac-Man's 1500th anniversary.

(Thanks to @Missingno123311 for providing today's fact!) pic.twitter.com/rQ59xfEepm

— Daily Pac-Man (@DailyPacMan) August 8, 2023