Pentaminx puzzle
So this might not be an exactly Rubik cube, but we took the question as the kind of puzzles as Rubik cube!
And this my friends, is the biggest one we could found. It is the Pentaminx, and it is probablly the most difficult puzzle you will ever find.
It’s an incredible expensive toy, it costs around $250, but if you are, or your friend is, into Rubik cubes, this might be one of the best gifts ever, or there is a big chance they will hate your for life too when they struggle to solve it.