Each detector has a range. The first one has a 3m range, so maybe you didn't get lucky, especially that holes are random generated... or I screwed up.
In tutorial there is 100% chance for treasure to be sure that you have a money to start with so it is planned indeed. ;)
I just changed the text, because I had dark mode on on my browser. I'll make sure to have that in mind next time.
Thanks for giving my game a try! <3