1. There should be at least two players with one mobile device each. One player will join the game as Mr X. The others will join as detectives.
2. They will be able to see their own icons on their respective screens (self icon).
3. On the screen of Mr X, he will be able to see the other players' icon (detective icon)
4. On the the screen of the detectives, they will be able to see Mr X's icon after every n seconds. Time, t=0 is defined the time when Mr X joins.
5. Mr X's icon will appear at the same time on all screens of the detectives.
6. Mr X's icon will only appear for m seconds each time it appears.

(in this test, we define n = 30, m = 5)

To avoid confusion on when Mr X shows up when detectives join at different time, the following timing diagram is showed:

 Time joined/Players 0---------10---------20---------30------> seconds
 
 Mr X                Joined-----------------------------------                          
 Detective 1         Joined--------------------------Show Mr X
 Detective 2                      Joined-------------Show Mr X
 Detective 3                               Joined----Show Mr X