The "Black Hole"

Aim: The “Black Hole” is a puzzle made of 26 cubes moving in a 3×3×3 cubicle skeleton. Each small cube has its faces with either a gray star, a coloured star or empty black. The aim is to move the cubes to have either the whole visible faces black, or all with gray stars (coloured stars are always bad). The 3 special faces shown on the picture with the words “Peter’s Black Hole” must always fit the truncated corner.

Difficulty: +++

Solved: yes