This game has unused graphics.
There was a demo playable / video shown at ECTS in London in August 2003
Pac-Man Vs. is a multiplayer game which utilized the system's Game Boy Advance connectivity, along with having Mario as the announcer for some reason.
pac_katakana.bti, present in PAC_title.szs, contains the game's name in Japanese.
Leftover Memory Card Banner
Present in the Memory Card folder are banner icons from Tetris Attack (or whatever name you want to use for it). Pac-Man Vs. doesn't use the Memory Card.