For the SD Permission that is a mistake for App2SD testing.
This does only a simple thing, augment the track on the picture or call them tracker.
Print out that two picture which call Tracker 1 and Tracker2.
Put Tracker1 in front of the camera the track augment on the picture.
After the first track active, you can active the second track with Tracker2.
When both track on screen, they can interact each other.
Not too many interaction, put the trackers in right place then they will connect.
I think marker base AR is too troublesome and not too good other then commercial.
So there lot of space to improve. And though the questions I know this app an epic fail which cant explain it's interaction.
May be there is a next version with improved asset and description in game.