Level 6 is plain confusing. First, instakill by false treasure boxes is annoying, unlike with countdown on mines, getting a distance after opening a box doesn't help. Second, you offer the distance detector only after a while, thus many fall victim to instakill without having a clue. Third, it is confusing to mark the right box with the most distance marks if it is actually the closest one at that moment. Went after a completely different box at first.
A clue in this level is the fact, that around the spawn point placed several chests...