This secret trail to discover amsterdams city centreis an experience where you solve 12 clues via text message the trail takes you exploring the city centre and its secret and lesser known places as you search for answers hidden across the red light district and canal belt area the recommended number of players is 2 5 people per team you can play one trail per phone number at a time you can buy more than one trail using the same phone number but you can only start playing the second tra