# Message #2896

From: Melinda Green <melinda@superliminal.com>

Subject: Re: [MC4D] RE: MPUltimate 1.5

Date: Sun, 19 Jan 2014 17:08:42 -0800

If there exist any puzzles that humans really can’t solve, I don’t know

of them. Do you?

I am surprised that the 120Z may be more difficult than the 24-cell

version, both because the more typical 24-cell puzzles are so hard and

because the 120-cell generates no real headaches; it just takes a very

long time. If this is true, then it makes me wonder whether large

Z-cubes might also be difficult in more ways than just piece-finding.

5^4Z anyone?

-Melinda

On 1/18/2014 5:17 PM, mananself@gmail.com wrote:

>

>

> I have to say, before knowing that you have solved 2C, I didn’t even

> plan to work on it. I have no idea about the orbits of 2C on 120Z yet.

> Maybe one can find an algorithm by first flipping a cell, and then use

> an even number of moves to solve the 2C pieces, and observe the 3C

> parity changes.

>

>

> After all, the problem of orbit parity is a commutative problem,

> meaning A B = B A in terms of orbit parity. It’s just like Lights Out

>

> http://en.wikipedia.org/wiki/Lights_Out_(game)

>

> but with a complicated geometry. I’m still positive that it’s solvable

> by human.

>

>

> Nan

>

>

>

>