When I started thinking about a LocoMatrix treasure hunt, I created a photo version just to try out with friends. How this worked was, I took a picture from my front door which the player looked at and then at a following picture which was something that could be seen in the former (though not just an enlarged section of the first – I actually stood close to the object in question.
On “playback” during the game, the player would move in the direction of the first picture and then start looking for the feature of the second. When he has found it, he would click on a button, and if he is right, would then get the next picture pair. Points can be awarded for the time it takes to get there (or bonus/penalty for nearness to suggested time).
Interesting things happened on my first trial, in that 3 of the features had changed since I created the sequence in the morning.
Here, the windbreak for the cafe that had been taken down in the late afternoon
and here, amazingly the pane of glass through which this was shot had been repaired (it must have been like that for at least 2 years)