About that swap behaviour, that you mentioned here: where is it? 

I read all the documentation yesterday, and couldn't remember anything about that, so I searched the documentation site, but it came up empty. 

Is it a new feature, or just hidden well?

(I couldn't reply to the comment directly like I wanted to, because the little hover menu with the links to edit/reply doesn't work on iPad.)

Uhm.. I think this might work, if I understand what you're trying to do:

Set up a page counter and give it a name.

On the pattern they tap to choose, have the following action set:
Interaction: Tap
Behavior: CounterSet
Target: The countername
Counter value: the number for the pattern that should be revealed (lets say 1 for blue pattern)

On the objects they tap to fill with the pattern they chose, have the following action set:
Interaction: Tap
Behavior: Show
Target: The hidden layer that should be shown (in this example hidden blue pattern matching the place they tap)
Condition: Page counter is value
Element: The countername
Value: the number that matches the one you set before

It worked for me with two different hidden objects and two different counterset numbers, so give it a try :)

I'm trying to figure out how to do this, and figured I'd start with 2 sets, since that should be enough to establish a workflow.

So I have 2 pairs. A tree and a cloud, and matching words.
To test the basics, I made words visible at page load, and to hide both image and text when tapped. It worked on both.

Then I made a timer and a button to start the timer with.
That works too.

To combine, I now tried to hide the words at pageload, and only to show when the timer starts up. And only one words shows up! What gives?

I have copied the text field and changed the name in properties, and changed the text, and only the copy shows up at party time. *sobs*

Props and action sets look like this:










Think it's time for bed. Perhaps my brain will see it more clearly tomorrow :P

Alright.. tried it, and (as you may have feared), I couldn't make it work.
The counter does not reset. I have tried on the counter itself too, but that didn't work either. Should it be on both?

Here are my action sets:

Perhaps you could use this sample app, to see how it works. Sounds like much of the same functionality: http://feedback.interactbuilder.com/topic/360719-scrollable-background/#comment_367107

I'll try that. Thanks :)

So I can make an action set like this?

Interaction: none
Behavior: reset counter (or something like that)
Target: my countername
Condition: Page counter is 2

Oh, cool. That could be a solution. I'll give it a try :)
But check my last comment, to see how this would not solve my problem with the match game ;)

I like to keep your creative thinking sharp and on the edge, don't you think?

Okay, that would work, I think.

In fact, I would like to use the non-existing  functionality for the memory game too. I'm not a fan of the fade in/out thing. It works, but it's not practical and not so pretty.

I have tried to just unmask when a card is clicked, and let it stay that way, until the next card is tapped. If they don't match, I want them to mask right away when a third card is clicked. If it's a match, they'll go to a stack in the corner with the move animation.

I was trying to use the counter, to make it work like I imagined, but no luck so far. I can unmask and count that I've tapped x amount of cards. I can also re-mask when the counter hits two, and animate them to a stack in the corner if there's a match.. But when I tried to figure out how to reset the counter after the re-masking or match, I was lost.

If there was a way to tell that maximum two cards from the group could be shown at the time, then I could do it like I wanted to.  

If we take the 490 outside the screen and 10 on screen, how will the page know when the game is over?