Build Battle Halloween Hyper Mode seems to be missing

[ThoSqbo]

Quite a mouthful isn't it?
Anyways, there's a Halloween exclusive achievement where you must win 1 game of BBHHM (+5 ap). It seems that the game is missing from the build battle lobby or been relocated somewhere. Does anyone know where it can be found? Any help is greatly appreciated.

Also, if this game has indeed been removed permanently, shouldn't this achievement be categorized as legacy?

And yes, those 5 achievement points are worth more than my sanity.

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