Radio Rayless is a video game developed in 2002 by Now Production that was going to be released for the GBA. The game ended up being cancelled however for seemingly unknown reasons. The game was shown on several Nintendo leaflets alongside other GBA titles as well as Gamecube ones, but so far nothing of the game has surfaced, & a screenshot from one of the leaflets is the only way to actually see what the game would've looked like.
From the looks of it, it was a futuristic racing game where you control ships around what seem to be voids with multiple objects stranded around. The track's grid design gives off an F-Zero look to it, indicating that this might be some spiritual successor of sorts before an official F-Zero GBA game hit the shelves.