How Do I Unlock Dark Orange Secondary?

[LunchThyme]

So 2.1 just came out, and with it a few new colours, one of them being dark orange. You get it as a primary for beating the new level (Fingerdash) in practice mode, but you need a secret to unlock it as a secondary.
I was wondering if anyone knew what the secret is, as google has let me down. Many thanks to anyone who can help.

[LunchThyme]

Finally found it on wikipedia, turns out you have to beat the lava gauntlet.

I crie ;_;

[Chueki]

Thanks for answering your own question when you find the answer. You help me a lot!

[yrnie]

Yeah thanks, it helped a lot.

[Spamton Ai #KillTf2]

yeah, thanks

[sgrp270]

thank you