I figured out how to use lists and variables to pick a random item from the list and preform an action based on the selection. My question is, is there a way to block a selection once it has been made? For instance, if the first time the game selects item 2 from the list I want to make it so item 2 can no longer be selected the next time that a selection is made. I also want to be able to repeat this until all selections have been made. That way all selections can only be made once, but in a completely random order.

Here's a link to my project, so that you can see what I have so far.

http://scratch.mit.edu/projects/45814060/

you could make a list with

(things picked :: list)

and
make it so if it picks a item in that list it picks again

or make it remove a item from the list that is picked

I can make a picked list fairly easily, but I'm not able to get that to help. At first I was trying to figure out a way to simply delete an item once picked. However, I don't seem able to get that to work since as soon as one item is deleted all the other items change places on the list and I can only get it delete based on place number not item name.

1. Make a list with all the items that could be picked in it.

2. Duplicate this script so that there are 2 scripts with the same item in them

3. Run the normal script except right where it performs a selection tell it to delete that item from list 1. List 2 is simply a backup so that you don't loose all the items. It will probably look something like this:

when green flag clicked
set [selection # v] to (pick random (1) to (length of [list 1  v]))
perform action based on the item selected
delete (selection #) of [list 1  v]

After all the selection have been picked use this script to put them back into list 1 from list 2:

set [counter v] to [1]
repeat (length of [list 2 v])
add (item (counter) of [list 2  v]) to [list 1  v]
change [counter v] by [1]
end

Imaginary Number. I tried something very similar to your top script. (I think) Except it didn't delete the item the way I thought it would. I have a variable called choice and a list called color. This is what I tried first.

.

when this sprite clicked
set [(choice) v] to [ (item (random v) of [color  v])]
broadcast [(choice) v]
delete ((choice) v) of [  color v]

I also tried going a completely different route, where i basically toggled each selection to off by renaming them after they were selected. This mostly works. The problem I'm having now is that the computer wants to go forever and I don't know how to have the computer recognize that all selections have been made. You can check out what I have using the link below.



http://scratch.mit.edu/projects/45830498/

Edit: I now have it working, but I'm sure that there is a much better way to solve this problem. Please look at what I have and make suggestions.