"...the 1996 target date for Project Atlantis and the GBA's 2001 release is quite a gap. Why the delay? My guess is: Pokémon. Game Freak's socially-driven cockfighting RPG was an unexpected end-of-life hit for the Game Boy, and its out-of-left-field success added years to the fading system's life. The popularity of Pokémon might actually have been the first time Nintendo realized that technology and profitability don't go hand-in-hand." That's an interesting way of looking at it. (Also: an interesting piece on the Nintendo super-portable that never was).

"...it turns out that a GBA and a cart isn’t any more use than a GBA on its own. It’s only when you build a machine out of a GBA and a cart and a me that you’ve got a real Rhythm Tengoku Machine. Bolt those three components together and you’ve built an entirely new organism, an extraordinary creature who can shoot ghosts, dance with monkeys, and climb stars like staircases."

Another World GBA port, ROM image - completely free, and apparently "official"...