The GameBoy Advance belongs to a simpler time, when buttons were king. That's why it's so great to see a video of GBA title Rhythm Heaven played in a way we're fairly certain the developers never considered.
The video below shows a simple circuit involving a laser pointer, a prosthetic finger and, of course, a Japanese sword. When the blade of the sword breaks the laser's path, it activates the circuit causing the finger to push down against the GBA's buttons. It's absolutely elegant in its simplicity, yet not exactly the most practical of control schemes.
Let's hope when Rhythm Heaven for Wii is released it can recreate this minigame without the need for prosthetic fingers.