How can I get color GRAY using “set pen color to” and “set pen shade”?
or
How can I get color GRAY using blocks with number values (not color picker).

Looks like set-pen-color X works for 200 values (my bet is there is X mod 200 inside)
set-pen-shade makes a color more or less dark
I cant get BLACK, GRAY and WHITE colors this way. Help

Information on the web is not clear.
https://wiki.scratch.mit.edu/wiki/Set_Pen_Color_to_()_(color-picker_block)
“All of the possible colors accessible with the Set Pen Color to () block (without changing the shade.)”
I agree. I get 200 colors too.
“Reporter Input
One of Scratch 2.0's secrets is that the color box allows a reporter block to be inputted. In this case, when the block runs, the color will be set to the RGB value of the reporter. This situation can be replicated with the following custom block”
This does not work for me at all.

Just try dis

If you know how to work with rgb which hex, this is should be simple for you to get your desired color
Go to here to get colour tables for examples

then just change 824da2 with code that you picked in table, ignore #.

—
Gray colour that you asked:

Thank you for great answer! It works. Yes, I know hex.

That's no problem
wehgh “blox” is a typo, i was actually wanted to said “a block”

For this tip, Its possibility is depends on how Scratch could also treat hexadecimal as numbers.

An conclusion and simple solution to selecting a color is by above,
an original one was actually uses

I'm working on a maze game using @griffpatch ‘s tutorial. I don’t want the walls to be blue,but the blocks he is using are these:

_ThatBluAxolotl_ wrote:

(#5)
I'm working on a maze game using @griffpatch ‘s tutorial. I don’t want the walls to be blue,but the blocks he is using are these:

Please don't necropost; thanks.