The GBA connector, one of Nintendo's experiments with integrating its portable and home consoles, spawned only a handful of games: Final Fantasy Crystal Chronicles, Four Swords Adventures and Pac-Man VS. The latter title had one character play as Pac-Man viewing the classic screen (via the Game Boy) while the other three played as the ghosts in an isometric view on the TV.
Namco is revisiting Pac-Man VS in its Namco Museum collection for the DS. The game sports single pack multiplayer and is priced at $20. Other games in the collection include Dig Dug II, Xevious, Pac-Man, Mappy, Galaxian, Galaga, and Tower of Druaga. We're happy paying $20 just for the multiplayer Pac-Man VS action.