The five cubed 3D Chess

Basically I remember reading about a form of 3D Chess that used five five-by-five Chess boards and twenty pieces on a side. Rooks that could only move through the walls of cubes, Bishops that could only move through the edges of cubes, Unicorns which could only move through the points of cubes, plus Queens, Kings, Knights, and Pawns, worked out on similar priceples.

Does anyone else know about this varrient? Does anyone play it?

The five cubed 3D Chess