In Loquiz scavenger game type it would be easy to build a game where you have an EMPTY map at the beginning of the game. 

You need to go to locations to bring stuff to a map (for example, using a printed legend or bits of info through chat functionality to find right spots or visiting locations marked on the image of the map overlay).

For example, the simplest way it would work is that you have  8 locations with 10m radius with hidden pins and invisible radii. So the map appears empty but it actually has 8 active locations.

Each of these invisible locations will bring a location onto the  map that has an invisible radius and a special pin (lets say a letter or a pictogram) and the  radius of 0 m (so it cannot be activated – it just stays there).

If each single appearing pin is a letter, then you could make it so that a word or sentence appears onto the map slowly as you visit the locations. That is the solution to finish the game.