The GBA Battletoads is an unreleased entry in the series. A prototype was released by RareWareCentral on November 19, 2011. The game at this point is very primitive and doesn't even have a proper title screen.
This image shows what seems to be an early Ragnarok 0, with a near-identical layout. Minor differences abound, such as Ragnarok 0 being slightly bigger than this map, a few layout differences, and the fact that Trial 0 uses placeholder graphics to show the layout. The only enemy is an invincible Dragon at the very beginning of the stage, which attacks like the one in the previous stage.
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