| This tunnel is not yet released!
This tunnel is not yet released, but there is evidence that this exist in the game, and will probably be published later.
The J-Tunnel is a side tunnel that branches out from the H-Tunnel, although which level is unknown. There is evidence in the code for it existing, but no one knows for sure whether this tunnel will be released. It is 6 levels long. J-tunnel is pretty much unidentified.