So..What IS beyond the red doors?

[Erahgon]

I can't even see how many red doors there are since I was only able to get one red key, but I'm assuming that it's the same as the number of gold rooms...

So is it an extra set of super hard levels or is it a true ending?

[Tinker]

It was bugged earlier, and people could get through, so spoilers:
It's a level called Giga Difficult, which is... Giga Difficult. It's in the style of the tutorial, and quite big.
It also looks like there will be more around that place in the future.

[Hyakitaki]

Spoilers but here is a picture beyond the red doors.... Be aware that the tunnel is quite long (I think it's 16 red locked doors long)


http://i203.photobucket.com/albums/aa41/Planket/GigaDifficult.jpg

[Blorbes]

There is the hardest (I think?) level there.

Spoiler:
http://www.youtube.com/watch?v=Gbht5N8r2z0